Changes to triplet characters

More examples and some minor fixes
Added music21 and csound examples
2023-12-10 14:45:58 +02:00 · 2023-06-29 00:03:45 +03:00 · 2023-06-28 00:55:56 +03:00 · 2023-05-06 19:38:19 +03:00 · 2023-04-29 17:06:07 +03:00 · 2023-04-26 21:14:21 +03:00
41 changed files with 5369 additions and 2558 deletions
--- a/.gitignore
+++ b/.gitignore
@ -165,6 +165,8 @@ cython_debug/
 # VSCode
 .vscode

-# Debugging file
-debug.py
+# Debugging files
+debug/
+debug*.py
+test.py

--- a/MANIFEST.in
+++ b/MANIFEST.in
@ -0,0 +1,4 @@
+include ziffers/*
+include ziffers/classes/*
+include ziffers/spec/*
+global-include *.lark
--- a/README.md
+++ b/README.md
@ -1,4 +1,59 @@
 # Ziffers for Python 3.10+

-This repo is hosting an attempt at porting the [Ziffers](https://github.com/amiika/ziffers) numbered musical notation to Python 3.10+. This library is using [parsimonious](https://github.com/erikrose/parsimonious) for PEG parsing.
+This repo is hosting experimental parser for the [Ziffers](https://github.com/amiika/ziffers) numbered musical notation to Python 3.10+. This library is using lark lalr-1 parser and ebnf PEG for parsing the notation.

+## Supported environments
+
+Ziffers python supports following live coding and computer-aided composition environments:
+
+* [Sardine](https://github.com/Bubobubobubobubo/sardine)
+* [Music21](https://github.com/cuthbertLab/music21)
+* [Csound](http://www.csounds.com/manual/html/ScoreTop.html)
+* [Sonicsynth](https://github.com/Frikallo/SonicSynth)
+
+# Status:
+
+**Supported:**
+```
+Pitches: -2 -1 0 1 2
+Chords: 0 024 2 246
+Note lengths: w 0 h 1 q 2 e 3 s 4
+Subdivision: [1 2 [3 4]]
+Decimal durations: 0.25 0 1 <0.333>2 3
+Octaves: ^ 0 ^ 1 _ 2 _ 3
+Escaped octave: <2> 1 <1>1<-2>3
+Named chords: i i i i
+Randoms: % ? % ? % ?
+Random between: (-3,6)
+Repeat: [: 1 (2,6) 3 :4]
+Repeat cycles: [: <q e> (1,4) <(2 3) (3 (1,7))> :]
+Lists: h 1 q(0 1 2 3) 2
+List cycles: (: <q e> (1,4) <(2 3) (3 (1,7))> :)
+Loop cycles: <0 <1 <2 <3 <4 5>>>>>
+Basic operations: (1 2 (3 4)+2)*2 ((1 2 3)+(0 9 13))-2 ((3 4 10)*(2 9 3))%7
+Product operations: (0 1 2 3)+(1 4 2 3) (0 1 2)-(0 2 1)+2
+Euclid cycles: (q1)<6,7>(q4 (e3 e4) q2) (q1)<6,7>(q4 q3 q2)
+Transformations: (0 1 2)<r> (0 1 2)<i>(-2 1)
+List assignation: A=(0 (1,6) 3) B=(3 ? 2) B A B B A
+Random repeat: (: 1 (2,6) 3 :4)
+```
+
+**New features:**
+```
+Shorthand for random repeat: (2 5):3 [2 5 1]:4 (1,6):6
+```
+
+**Partial support:**
+```
+Escape/eval: {10 11} {3+1*2} // {1.2 2.43} NOT SUPPORTED YET.
+Roman chords: i ii iii i^maj i^7
+```
+
+**TBD:**
+```
+Random selections: [q 1 2, q 3 e 4 6]
+Conditionals: 1 {%<0.5?3} 3 4 (: 1 2 {%<0.2?3:2} :3)
+Functions: (0 1 2 3){x%3==0?x-2:x+2}
+Polynomials: (-10..10){(x**3)*(x+1)%12}
+Modal interchange (a-g): iiia ig ivf^7
+```
--- a/example.musicxml
+++ b/example.musicxml
@ -0,0 +1,101 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!DOCTYPE score-partwise  PUBLIC "-//Recordare//DTD MusicXML 4.0 Partwise//EN" "http://www.musicxml.org/dtds/partwise.dtd">
+<score-partwise version="4.0">
+  <movement-title>Music21 Fragment</movement-title>
+  <identification>
+    <creator type="composer">Music21</creator>
+    <encoding>
+      <encoding-date>2023-06-27</encoding-date>
+      <software>music21 v.9.1.0</software>
+    </encoding>
+  </identification>
+  <defaults>
+    <scaling>
+      <millimeters>7</millimeters>
+      <tenths>40</tenths>
+    </scaling>
+  </defaults>
+  <part-list>
+    <score-part id="P0c4c819b93d5335473e23baff277bd9f">
+      <part-name />
+    </score-part>
+  </part-list>
+  <!--=========================== Part 1 ===========================-->
+  <part id="P0c4c819b93d5335473e23baff277bd9f">
+    <!--========================= Measure 1 ==========================-->
+    <measure implicit="no" number="1">
+      <attributes>
+        <divisions>10080</divisions>
+        <time>
+          <beats>4</beats>
+          <beat-type>4</beat-type>
+        </time>
+        <clef>
+          <sign>G</sign>
+          <line>2</line>
+        </clef>
+      </attributes>
+      <note>
+        <pitch>
+          <step>D</step>
+          <alter>0</alter>
+          <octave>4</octave>
+        </pitch>
+        <duration>10080</duration>
+        <type>quarter</type>
+      </note>
+      <note>
+        <pitch>
+          <step>E</step>
+          <alter>0</alter>
+          <octave>4</octave>
+        </pitch>
+        <duration>10080</duration>
+        <type>quarter</type>
+      </note>
+      <note>
+        <rest />
+        <duration>10080</duration>
+        <type>quarter</type>
+      </note>
+      <note>
+        <pitch>
+          <step>D</step>
+          <alter>0</alter>
+          <octave>4</octave>
+        </pitch>
+        <duration>5040</duration>
+        <type>eighth</type>
+      </note>
+      <note>
+        <chord />
+        <pitch>
+          <step>E</step>
+          <alter>0</alter>
+          <octave>4</octave>
+        </pitch>
+        <duration>5040</duration>
+        <type>eighth</type>
+        <accidental>natural</accidental>
+      </note>
+      <note>
+        <chord />
+        <pitch>
+          <step>G</step>
+          <alter>0</alter>
+          <octave>4</octave>
+        </pitch>
+        <duration>5040</duration>
+        <type>eighth</type>
+      </note>
+      <note print-object="no" print-spacing="yes">
+        <rest />
+        <duration>5040</duration>
+        <type>eighth</type>
+      </note>
+      <barline location="right">
+        <bar-style>light-heavy</bar-style>
+      </barline>
+    </measure>
+  </part>
+</score-partwise>
--- a/examples/csound/play_with_csound.py
+++ b/examples/csound/play_with_csound.py
@ -0,0 +1,42 @@
+"""Example of using ziffers with Csound score."""
+try:
+    import ctcsound
+except (ImportError,TypeError):
+    csound_imported = false
+    
+from ziffers import *
+
+# Csound numeric score is very versatile so it is hard to do generic tranformer
+# See http://www.csounds.com/manual/html/ScoreTop.html and http://www.csounds.com/manual/html/ScoreStatements.html
+
+# There is a simple converter implemented that uses format:
+# i {instrument} {start time} {duration} {amplitude} {frequency}
+# See ziffers_to_csound_score in ziffers/converters.py
+
+if(csound_imported):
+
+    # Parse ziffers notation, scale in SCALA format
+    parsed = zparse("w 0 024 q 0 1 2 346 r e (5 3 9 2 -605)+(0 -3 6) q 0h24e67s9^s1^e3^5^7", key="D4", scale="100. 200. 250. 400. 560.")
+
+    score = ziffers_to_csound_score(parsed, 180, 1500, "FooBar") # 180 bpm, 1500 amplitude, FooBar instrument
+
+    print("Generated score:")
+    print(score)
+
+    # Define FooBar Csound instrument
+    orc = """
+    instr FooBar
+        out(linen(oscili(p4,p5),0.1,p3,0.1))
+    endin
+    """
+
+    # Run score with Csound
+    c = ctcsound.Csound()
+    c.setOption("-odac")
+    c.compileOrc(orc)
+    c.readScore(score)
+    c.start()                               
+    c.perform() 
+    c.stop()
+else:
+    print("Csound not found! First download from https://csound.com/ and add to PATH or PYENV (Windows path: C:\Program Files\Csound6_x64\bin). Then install ctcsound with 'pip install ctcsound'.")
--- a/examples/jupyter/test_jupylet.ipynb
+++ b/examples/jupyter/test_jupylet.ipynb
@ -0,0 +1,82 @@
+{
+ "cells": [
+  {
+   "cell_type": "code",
+   "execution_count": 10,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Playing note: 60\n",
+      "Playing note: 67\n",
+      "Playing note: 64\n",
+      "Playing note: 69\n",
+      "Playing note: 65\n",
+      "Playing note: 76\n",
+      "Playing note: 67\n",
+      "Playing note: 64\n",
+      "Playing note: 69\n",
+      "Playing note: 65\n",
+      "Playing note: 62\n",
+      "Playing note: 71\n",
+      "Playing note: 74\n",
+      "Playing note: 65\n",
+      "Playing note: 67\n",
+      "Playing note: 69\n",
+      "Playing note: 64\n",
+      "Playing note: 62\n"
+     ]
+    },
+    {
+     "name": "stderr",
+     "output_type": "stream",
+     "text": [
+      "Stream callback called with status: <sounddevice.CallbackFlags: output underflow>.\n",
+      "Stream callback called with status: <sounddevice.CallbackFlags: output underflow>.\n"
+     ]
+    }
+   ],
+   "source": [
+    "from jupylet.audio.bundle import *\n",
+    "from clockblocks import *\n",
+    "from ziffers import *\n",
+    "\n",
+    "melody = zparse(\"q 0 4 2 5 e 3 9 4 2 s 5 3 1 6 8 3 4 5 2 1\")\n",
+    "bpm = 180\n",
+    "\n",
+    "clock = Clock(initial_tempo=bpm)\n",
+    "\n",
+    "for n in melody.evaluated_values:\n",
+    "    if(isinstance(n, Pitch)):\n",
+    "        print(\"Playing note: \" + str(n.get_note()))\n",
+    "        tb303.play(n.get_note(), n.get_beat())\n",
+    "        clock.wait(n.get_beat())\n",
+    "\n"
+   ]
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "Python 3",
+   "language": "python",
+   "name": "python3"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 3
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython3",
+   "version": "3.11.0b4"
+  },
+  "orig_nbformat": 4
+ },
+ "nbformat": 4,
+ "nbformat_minor": 2
+}
--- a/examples/jupyter/test_music21.ipynb
+++ b/examples/jupyter/test_music21.ipynb
--- a/examples/music21/create_midi_file.py
+++ b/examples/music21/create_midi_file.py
@ -0,0 +1,26 @@
+from music21 import *
+from ziffers import *
+
+# Create melody string
+melody = "q 0 2 4 r e 1 4 3 2 s 0 1 2 6 e 2 8 2 1 h 0"
+bass_line = "(q 0 2 4 6 e 1 4 3 2 s 0 1 2 6 e 2 8 2 1 h 0)-(7)"
+
+# Parse ziffers notation to melody from string
+parsed = zparse(melody)
+parsed_bass = zparse(bass_line)
+
+# Convert to music21 objects
+part1 = to_music21(parsed, time="4/4")
+part2 = to_music21(parsed_bass, time="4/4")
+
+# Add instruments
+part1.insert(instrument.Piano())
+part2.insert(instrument.Soprano())
+
+# Create score
+song = stream.Score()
+song.insert(0,part1)
+song.insert(0,part2)
+
+# Write to midi file under examples/music21/midi folder
+song.write('midi', fp='examples/music21/output/ziffers_example.mid')
--- a/examples/music21/create_musicxml.py
+++ b/examples/music21/create_musicxml.py
@ -0,0 +1,9 @@
+from music21 import *
+from ziffers import *
+
+# Parse ziiffers object to music21 object
+parsed = zparse("q 1 024 5 235 h 02345678{12} 0", key='C', scale='Zyditonic')
+s2 = to_music21(parsed,time="4/4")
+
+# Save to MusicXML file
+s2.write('musicxml', fp='examples/music21/output/ziffers_example.xml')
--- a/examples/music21/create_png.py
+++ b/examples/music21/create_png.py
@ -0,0 +1,9 @@
+from music21 import *
+from ziffers import *
+
+# Parse ziiffers object to music21 object
+parsed = zparse('1 2 qr e 124')
+s2 = to_music21(parsed,time="4/4")
+
+# Save object as png file
+s2.write("musicxml.png", fp="examples/music21/output/example.png")
--- a/examples/music21/output/example-1.png
+++ b/examples/music21/output/example-1.png
--- a/examples/music21/output/example.musicxml
+++ b/examples/music21/output/example.musicxml
@ -0,0 +1,99 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!DOCTYPE score-partwise  PUBLIC "-//Recordare//DTD MusicXML 4.0 Partwise//EN" "http://www.musicxml.org/dtds/partwise.dtd">
+<score-partwise version="4.0">
+  <identification>
+    <encoding>
+      <encoding-date>2023-06-27</encoding-date>
+      <software>music21 v.9.1.0</software>
+    </encoding>
+  </identification>
+  <defaults>
+    <scaling>
+      <millimeters>7</millimeters>
+      <tenths>40</tenths>
+    </scaling>
+  </defaults>
+  <part-list>
+    <score-part id="P2a5e2bdd0bc8bab63f324063ff62ac90">
+      <part-name />
+    </score-part>
+  </part-list>
+  <!--=========================== Part 1 ===========================-->
+  <part id="P2a5e2bdd0bc8bab63f324063ff62ac90">
+    <!--========================= Measure 1 ==========================-->
+    <measure implicit="no" number="1">
+      <attributes>
+        <divisions>10080</divisions>
+        <time>
+          <beats>4</beats>
+          <beat-type>4</beat-type>
+        </time>
+        <clef>
+          <sign>G</sign>
+          <line>2</line>
+        </clef>
+      </attributes>
+      <note>
+        <pitch>
+          <step>D</step>
+          <alter>0</alter>
+          <octave>4</octave>
+        </pitch>
+        <duration>10080</duration>
+        <type>quarter</type>
+      </note>
+      <note>
+        <pitch>
+          <step>E</step>
+          <alter>0</alter>
+          <octave>4</octave>
+        </pitch>
+        <duration>10080</duration>
+        <type>quarter</type>
+      </note>
+      <note>
+        <rest />
+        <duration>10080</duration>
+        <type>quarter</type>
+      </note>
+      <note>
+        <pitch>
+          <step>D</step>
+          <alter>0</alter>
+          <octave>4</octave>
+        </pitch>
+        <duration>5040</duration>
+        <type>eighth</type>
+      </note>
+      <note>
+        <chord />
+        <pitch>
+          <step>E</step>
+          <alter>0</alter>
+          <octave>4</octave>
+        </pitch>
+        <duration>5040</duration>
+        <type>eighth</type>
+        <accidental>natural</accidental>
+      </note>
+      <note>
+        <chord />
+        <pitch>
+          <step>G</step>
+          <alter>0</alter>
+          <octave>4</octave>
+        </pitch>
+        <duration>5040</duration>
+        <type>eighth</type>
+      </note>
+      <note print-object="no" print-spacing="yes">
+        <rest />
+        <duration>5040</duration>
+        <type>eighth</type>
+      </note>
+      <barline location="right">
+        <bar-style>light-heavy</bar-style>
+      </barline>
+    </measure>
+  </part>
+</score-partwise>
--- a/examples/music21/output/ziffers_example.mid
+++ b/examples/music21/output/ziffers_example.mid
--- a/examples/music21/output/ziffers_example.xml
+++ b/examples/music21/output/ziffers_example.xml
@ -0,0 +1,228 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!DOCTYPE score-partwise  PUBLIC "-//Recordare//DTD MusicXML 4.0 Partwise//EN" "http://www.musicxml.org/dtds/partwise.dtd">
+<score-partwise version="4.0">
+  <movement-title>Music21 Fragment</movement-title>
+  <identification>
+    <creator type="composer">Music21</creator>
+    <encoding>
+      <encoding-date>2023-06-27</encoding-date>
+      <software>music21 v.9.1.0</software>
+    </encoding>
+  </identification>
+  <defaults>
+    <scaling>
+      <millimeters>7</millimeters>
+      <tenths>40</tenths>
+    </scaling>
+  </defaults>
+  <part-list>
+    <score-part id="P381d8734c7dfe8b1fbfca186c059f010">
+      <part-name />
+    </score-part>
+  </part-list>
+  <!--=========================== Part 1 ===========================-->
+  <part id="P381d8734c7dfe8b1fbfca186c059f010">
+    <!--========================= Measure 1 ==========================-->
+    <measure implicit="no" number="1">
+      <attributes>
+        <divisions>10080</divisions>
+        <time>
+          <beats>4</beats>
+          <beat-type>4</beat-type>
+        </time>
+        <clef>
+          <sign>G</sign>
+          <line>2</line>
+        </clef>
+      </attributes>
+      <note>
+        <pitch>
+          <step>C</step>
+          <alter>1</alter>
+          <octave>4</octave>
+        </pitch>
+        <duration>10080</duration>
+        <type>quarter</type>
+        <accidental>sharp</accidental>
+      </note>
+      <note>
+        <pitch>
+          <step>C</step>
+          <alter>0</alter>
+          <octave>4</octave>
+        </pitch>
+        <duration>10080</duration>
+        <type>quarter</type>
+        <accidental>natural</accidental>
+      </note>
+      <note>
+        <chord />
+        <pitch>
+          <step>F</step>
+          <alter>0</alter>
+          <octave>4</octave>
+        </pitch>
+        <duration>10080</duration>
+        <type>quarter</type>
+      </note>
+      <note>
+        <chord />
+        <pitch>
+          <step>A</step>
+          <alter>0</alter>
+          <octave>4</octave>
+        </pitch>
+        <duration>10080</duration>
+        <type>quarter</type>
+      </note>
+      <note>
+        <pitch>
+          <step>C</step>
+          <alter>0</alter>
+          <octave>5</octave>
+        </pitch>
+        <duration>10080</duration>
+        <type>quarter</type>
+      </note>
+      <note>
+        <pitch>
+          <step>F</step>
+          <alter>0</alter>
+          <octave>4</octave>
+        </pitch>
+        <duration>10080</duration>
+        <type>quarter</type>
+      </note>
+      <note>
+        <chord />
+        <pitch>
+          <step>G</step>
+          <alter>0</alter>
+          <octave>4</octave>
+        </pitch>
+        <duration>10080</duration>
+        <type>quarter</type>
+      </note>
+      <note>
+        <chord />
+        <pitch>
+          <step>C</step>
+          <alter>0</alter>
+          <octave>5</octave>
+        </pitch>
+        <duration>10080</duration>
+        <type>quarter</type>
+        <accidental>natural</accidental>
+      </note>
+    </measure>
+    <!--========================= Measure 2 ==========================-->
+    <measure implicit="no" number="2">
+      <note>
+        <pitch>
+          <step>C</step>
+          <alter>0</alter>
+          <octave>4</octave>
+        </pitch>
+        <duration>20160</duration>
+        <type>half</type>
+        <accidental>natural</accidental>
+      </note>
+      <note>
+        <chord />
+        <pitch>
+          <step>F</step>
+          <alter>0</alter>
+          <octave>4</octave>
+        </pitch>
+        <duration>20160</duration>
+        <type>half</type>
+        <accidental>natural</accidental>
+      </note>
+      <note>
+        <chord />
+        <pitch>
+          <step>G</step>
+          <alter>0</alter>
+          <octave>4</octave>
+        </pitch>
+        <duration>20160</duration>
+        <type>half</type>
+        <accidental>natural</accidental>
+      </note>
+      <note>
+        <chord />
+        <pitch>
+          <step>A</step>
+          <alter>0</alter>
+          <octave>4</octave>
+        </pitch>
+        <duration>20160</duration>
+        <type>half</type>
+        <accidental>natural</accidental>
+      </note>
+      <note>
+        <chord />
+        <pitch>
+          <step>C</step>
+          <alter>0</alter>
+          <octave>5</octave>
+        </pitch>
+        <duration>20160</duration>
+        <type>half</type>
+        <accidental>natural</accidental>
+      </note>
+      <note>
+        <chord />
+        <pitch>
+          <step>D</step>
+          <alter>-1</alter>
+          <octave>5</octave>
+        </pitch>
+        <duration>20160</duration>
+        <type>half</type>
+        <accidental>flat</accidental>
+      </note>
+      <note>
+        <chord />
+        <pitch>
+          <step>F</step>
+          <alter>0</alter>
+          <octave>5</octave>
+        </pitch>
+        <duration>20160</duration>
+        <type>half</type>
+        <accidental>natural</accidental>
+      </note>
+      <note>
+        <chord />
+        <pitch>
+          <step>G</step>
+          <alter>0</alter>
+          <octave>5</octave>
+        </pitch>
+        <duration>20160</duration>
+        <type>half</type>
+        <accidental>natural</accidental>
+      </note>
+      <note>
+        <chord />
+        <pitch>
+          <step>F</step>
+          <alter>0</alter>
+          <octave>6</octave>
+        </pitch>
+        <duration>20160</duration>
+        <type>half</type>
+        <accidental>natural</accidental>
+      </note>
+      <note print-object="no" print-spacing="yes">
+        <rest />
+        <duration>20160</duration>
+        <type>half</type>
+      </note>
+      <barline location="right">
+        <bar-style>light-heavy</bar-style>
+      </barline>
+    </measure>
+  </part>
+</score-partwise>
--- a/examples/music21/show_in_musescore.py
+++ b/examples/music21/show_in_musescore.py
@ -0,0 +1,9 @@
+from music21 import *
+from ziffers import *
+
+# Parse Ziffers string to music21 object
+s = to_music21('(i v vi vii^dim)@(q0 e 2 1 q 012)', key="d3", scale="Minor", time="4/4", bpm=190)
+
+# See https://web.mit.edu/music21/doc/installing/installAdditional.html
+# Attempt to open / show the midi in MuseScore
+s.show()
--- a/examples/sonicsynth/play_with_sonicsynth.py
+++ b/examples/sonicsynth/play_with_sonicsynth.py
@ -0,0 +1,17 @@
+'''Simple example of using SonicSynth to play Ziffers melody.'''
+from sonicsynth import *
+from ziffers import *
+import numpy as np
+
+melody = zparse("(q 0 4 2 5 e 3 9 4 2 s 5 3 1 6 8 3 4 5 2 1 q 0)+(0 3 -2 4 2)", key="E3", scale="Aerathitonic")
+
+def build_waveform(melody, bpm):
+    for item in melody.evaluated_values:
+        if isinstance(item, Pitch):
+            time_in_seconds = item.duration * 4 * 60 / bpm
+            yield generate_square_wave(frequency=item.freq, amplitude=0.25, duration=time_in_seconds)
+
+waveform = np.concatenate(list(build_waveform(melody,130)))
+
+player = Playback(44100)
+player.play(waveform)
--- a/examples/sonicsynth/test_arpeggio_effect.py
+++ b/examples/sonicsynth/test_arpeggio_effect.py
@ -0,0 +1,23 @@
+'''Testing arpeggio effect with sonicsynth and ziffers'''
+from sonicsynth import *
+from ziffers import *
+import numpy as np
+
+melody = zparse("(q 0 024 2 246 e 4 2 6 2 q 5 0)+(0 3 1 2)", key="D4", scale="Minor")
+
+def build_waveform(melody, bpm):
+    for item in melody.evaluated_values:
+        if isinstance(item, Pitch):
+            time_in_seconds = item.duration * 4 * 60 / bpm
+            yield generate_sine_wave(frequency=item.freq, amplitude=0.5, duration=time_in_seconds)
+        elif isinstance(item, Chord):
+            time_in_seconds = item.durations[0] * 4 * 60 / bpm
+            for pitch in item.pitch_classes:
+                # Create "NES arpeggio effect"
+                for i in range(1,len(item.durations)):
+                    yield generate_sine_wave(frequency=pitch.freq, amplitude=0.5, duration=time_in_seconds/(len(item.durations)*3))
+
+waveform = np.concatenate(list(build_waveform(melody,180)))
+
+player = Playback(44100)
+player.play(waveform)
--- a/main.py
+++ b/main.py
@ -23,7 +23,7 @@ if __name__ == "__main__":
        "Repeat cycles": "[: <q e> (1,4)  <(2 3) (3 (1,7))> :]",
        "Lists": "h 1 q(0 1 2 3) 2",
        "List cycles": "(: <q e> (1,4) <(2 3) (3 (1,7))> :)",
-        "Loop cycles (for zloop or z0-z9)": "<0 <1 <2 <3 <4 5>>>>>",
+        "Loop cycles": "<0 <1 <2 <3 <4 5>>>>>",
        "Basic operations": "(1 2 (3 4)+2)*2 ((1 2 3)+(0 9 13))-2 ((3 4 {10})*(2 9 3))%7",
        "Product operations": "(0 1 2 3)+(1 4 2 3) (0 1 2)-(0 2 1)+2",
        "Euclid cycles": "(q1)<6,7>(q4 (e3 e4) q2) (q1)<6,7>(q4 q3 q2)",
@ -36,7 +36,6 @@ if __name__ == "__main__":
    }
    for ex in expressions:
        try:
-            print("Parsed: " + parse_expression(expressions[ex]).text)
+            print(f"{ex}: " + parse_expression(expressions[ex]).text)
        except Exception as e:
-            print(f"[red]Failed on {ex}[/red]")
-           # print(f"[red]Failed on {ex}[/red]: {str(e)[0:40]}...")
+            print(f"[red]Failed on {ex}[/red]: "+expressions[ex])
--- a/pyproject.toml
+++ b/pyproject.toml
@ -1,6 +1,6 @@
 [project]
-name = "python-ziffers"
-version = "0.1.0"
+name = "ziffers"
+version = "0.0.1"
 description = "Port of the Ziffers numerical notation for Python"
 authors = [
    {name = "Raphaël Forment", email="raphael.forment@gmail.com"},
@ -13,7 +13,10 @@ requires-python = ">=3.10"
 keywords = ["mininotation", "algorithmic music", "parser"]

 classifiers = [
-    "Topic :: Software Development"
+    "Topic :: Artistic Software",
+    "Programming Language :: Python :: 3",
+    "License :: OSI Approved :: MIT License",
+    "Operating System :: OS Independent",
 ]

 dependencies = [
@ -22,12 +25,34 @@ dependencies = [
    "pytest>=7.2.1",
 ]

+[build-system]
+requires = ["setuptools>=61.0"]
+build-backend = "setuptools.build_meta"
+
 [project.urls]
 homepage = "https://github.com/Bubobubobubobubo/ziffers-python"
 documentation = "https://github.com/Bubobubobubobubo/ziffers-python"
 repository = "https://github.com/Bubobubobubobubo/ziffers-python"

+[tool.setuptools]
+packages = ['ziffers','ziffers.classes','ziffers.spec']
+
 [tool.black]
-line-length = 88
-target_version = ['py310']
+target_version = ['py311']
 include = '\.pyi?$'
+exclude = '''
+(
+  /(
+      \.eggs         # exclude a few common directories in the
+    | \.git          # root of the project
+    | \.hg
+    | \.mypy_cache
+    | \.tox
+    | \.venv
+    | _build
+    | buck-out
+    | build
+    | dist
+  )/
+)
+'''
--- a/test.py
+++ b/test.py
@ -1,4 +0,0 @@
-from ziffers import *
-# a = z1("q e 1 ^ ^ 2 _ 3 4 <3> 3")
-a = z1("1 2")
-print(a.take(3))
--- a/tests/test_multi_03.py
+++ b/tests/test_multi_03.py
@ -0,0 +1,14 @@
+""" Test cases for the parser """
+import pytest
+from ziffers import zparse
+
+@pytest.mark.parametrize(
+    "pattern,expected",
+    [
+        ("1 2 3", [[1, 2, 3], [0.25,0.25,0.25]]),
+        ("q2 eq3 e.4", [[2, 3, 4], [0.25,0.375,0.1875]]),
+        ("{q9 e10 23}", [[9,10,23],[0.25,0.125,0.25]])
+    ],
+)
+def test_multi_var(pattern: str, expected: list):
+    assert zparse(pattern).collect(6, keys=["pitch_class", "duration"]) == [item*2 for item in expected]
--- a/tests/test_parser.py
+++ b/tests/test_parser.py
@ -1,54 +0,0 @@
-""" Test cases for the parser """
-import pytest
-from ziffers import parse_expression
-
-
-def test_can_parse():
-    expressions = [
-        "[1 [2 3]]",
-        "(1 (1,3) 1..3)",
-        "_^ q _qe^3 qww_4 _123 <1 2>",
-        "q _2 _ 3 ^ 343",
-        "2 qe2 e4",
-        "q 2 <3 343>",
-        "q (2 <3 343 (3 4)>)",
-    ]
-    results = []
-    for expression in expressions:
-        try:
-            print(f"Parsing expression: {expression}")
-            result = parse_expression(expression)
-            results.append(True)
-        except Exception as e:
-            print(e)
-            results.append(False)
-
-    # Return true if all the results are true (succesfully parsed)
-    print(results)
-    assert all(results)
-
-
-@pytest.mark.parametrize(
-    "pattern",
-    [
-        "1 2 3",
-        "q3 e4 s5",
-    ],
-)
-def test_parsing_text(pattern: str):
-    assert parse_expression(pattern).text == pattern
-
-
-@pytest.mark.parametrize(
-    "pattern,expected",
-    [
-        ("1 2 3", [1, 2, 3]),
-        ("q2 eq3", [2, 3]),
-    ],
-)
-def test_pitch_classes(pattern: str, expected: list):
-    assert parse_expression(pattern).pitch_classes() == expected
-
-# TODO: Add tests for octaves
-#        ("__6 _0 _1 _2 _3 _4 _5 _6 0 1 2 3 4 5 6 ^0 ^1 ^2 ^3 ^4 ^5 ^6 ^^0", [-2, -1, -1, -1, -1, -1, -1, -1, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 2]),
-#        ("_ 1 _2 <3>3 ^^4", [-1,-2,3,-1]),
--- a/tests/test_scale_01.py
+++ b/tests/test_scale_01.py
@ -2,8 +2,6 @@
 import pytest
 from ziffers import scale

-
-
@pytest.mark.parametrize(
    "name,expected",
    [
@ -49,5 +47,5 @@ def test_notenames(name: str, expected: int):
 )
 def test_note_to_midi(pitch_classes: str, expected: int):
    assert [
-        scale.note_from_pc(root=60, pitch_class=val, intervals="Ionian") for val in pitch_classes
+        scale.note_from_pc(root=60, pitch_class=val, intervals="Ionian")[0] for val in pitch_classes
    ] == expected
--- a/tests/test_singular_02.py
+++ b/tests/test_singular_02.py
@ -0,0 +1,210 @@
+""" Test cases for the parser """
+import pytest
+from ziffers import zparse, get_items
+
+# pylint: disable=missing-function-docstring, line-too-long, invalid-name
+
+def test_can_parse():
+    expressions = [
+        "0 1 2 3 4 5 6 7 8 9 T E",
+        "023 i iv iv^min",
+        "[1 [2 3]]",
+        "(1 (1,3) 1..3)",
+        "_^ q _qe^3 qww_4 _123 <1 2>",
+        "q _2 _ 3 ^ 343",
+        "2 qe2 e4",
+        "q 2 <3 343>",
+        "q (2 <3 343 (3 4)>)",
+        "? 1 2",
+        "(? 2 ? 4)+(1,4)",
+        "(1 2 <2 3>)+(0 1 2)"
+    ]
+    results = []
+    for expression in expressions:
+        try:
+            print(f"Parsing expression: {expression}")
+            result = zparse(expression)
+            results.append(True)
+        except Exception as e:
+            print(e)
+            results.append(False)
+
+    # Return true if all the results are true (succesfully parsed)
+    print(results)
+    assert all(results)
+
+
+@pytest.mark.parametrize(
+    "pattern",
+    [
+        "1 2 3",
+        "q3 e4 s5",
+    ],
+)
+def test_parsing_text(pattern: str):
+    assert zparse(pattern).text == pattern
+
+@pytest.mark.parametrize(
+    "pattern,expected",
+    [
+        ("1 2 3", [1, 2, 3]),
+        ("q2 eq3", [2, 3]),
+    ],
+)
+def test_pitch_classes(pattern: str, expected: list):
+    assert get_items(zparse(pattern),len(expected)*2,"pitch_class") == expected*2
+
+
+@pytest.mark.parametrize(
+    "pattern,expected",
+    [
+       ("__6 _0 _1 _2 _3 _4 _5 _6 0 1 2 3 4 5 6 ^0 ^1 ^2 ^3 ^4 ^5 ^6 ^^0", [-2, -1, -1, -1, -1, -1, -1, -1, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 2]),
+       ("_ 1 _2 <3>3 ^^4", [-1, -2, 3, 1]),
+       ("^ 1 ^1 3 _2 ^^1 _2 <-1> 2 ^4", [1, 2, 1, 0, 3, 0, -1, 0]),
+    ]
+)
+def test_pitch_octaves(pattern: str, expected: list):
+    assert get_items(zparse(pattern),len(expected)*2,"octave") == expected*2
+
+
+@pytest.mark.parametrize(
+    "pattern,expected",
+    [
+       ("w [1 [2 3]]", [0.5, 0.25, 0.25]),
+       ("1.0 [1 [2 3]] 4 [3 [4 5]]", [0.5, 0.25, 0.25, 1.0, 0.5, 0.25, 0.25]),
+       ("0.5 (0 0.25 3)+1", [0.5, 0.25]),
+       ("[0 2 <2 8>:2 4] 0", [0.05, 0.05, 0.05, 0.05, 0.05, 0.25])
+    ]
+)
+def test_subdivisions(pattern: str, expected: list):
+    assert get_items(zparse(pattern),len(expected)*2,"duration") == expected*2
+
+@pytest.mark.parametrize(
+    "pattern,expected",
+    [
+       ("[: 1 [: 2 :] 3 :]", [62, 64, 64, 65, 62, 64, 64, 65]),
+       ("(: 1 (: 2 :) 3 :)", [62, 64, 64, 65, 62, 64, 64, 65]),
+       ("(1 2:2 3):2", [62, 64, 64, 65, 62, 64, 64, 65]),
+       ("1:4",[62,62,62,62])
+    ]
+)
+def test_repeats(pattern: str, expected: list):
+    assert get_items(zparse(pattern),len(expected)*2,"note") == expected*2
+
+@pytest.mark.parametrize(
+    "pattern,expected",
+    [
+       ("[: 3 [2 4] :]", [0.25, 0.125, 0.125, 0.25, 0.125, 0.125]),
+       ("[: 1 [2 [5 6]] 3 [2 4] :]", [0.25, 0.125, 0.0625, 0.0625, 0.25, 0.125, 0.125, 0.25, 0.125, 0.0625, 0.0625, 0.25, 0.125, 0.125]),
+       ("(: 3 [2 4] :)", [0.25, 0.125, 0.125, 0.25, 0.125, 0.125]),
+       ("(: 1 [2 [5 6]] 3 [2 4] :)", [0.25, 0.125, 0.0625, 0.0625, 0.25, 0.125, 0.125, 0.25, 0.125, 0.0625, 0.0625, 0.25, 0.125, 0.125]),
+       ("(3 [2 4]):2", [0.25, 0.125, 0.125, 0.25, 0.125, 0.125]),
+       ("(1 [2 [5 6]] 3 [2 4]):2", [0.25, 0.125, 0.0625, 0.0625, 0.25, 0.125, 0.125, 0.25, 0.125, 0.0625, 0.0625, 0.25, 0.125, 0.125]),
+
+    ]
+)
+def test_repeat_durations(pattern: str, expected: list):
+    assert get_items(zparse(pattern),len(expected)*2,"duration") == expected*2
+
+@pytest.mark.parametrize(
+    "pattern,expected",
+    [
+       ("0 [0 2] 0", [0.25, 0.125, 0.125, 0.25, 0.25, 0.125, 0.125, 0.25, 0.25, 0.125, 0.125, 0.25]),
+       ("w 0 [0 [1 [2 3]] 0] 9", [1.0, 0.3333333333333333, 0.16666666666666666, 0.08333333333333333, 0.08333333333333333, 0.3333333333333333, 1.0, 1.0, 0.3333333333333333, 0.16666666666666666, 0.08333333333333333, 0.08333333333333333]),
+       ("1.0 0 [[2 3] [3 5]] 4", [1.0, 0.25, 0.25, 0.25, 0.25, 1.0, 1.0, 0.25, 0.25, 0.25, 0.25, 1.0]),
+       ("2.0 0 [1[2[3[4 5]6]7]8] 9", [2.0, 0.6666666666666666, 0.2222222222222222, 0.07407407407407407, 0.037037037037037035, 0.037037037037037035, 0.07407407407407407, 0.2222222222222222, 0.6666666666666666, 2.0, 2.0, 0.6666666666666666])
+
+    ]
+)
+def test_looping_durations(pattern: str, expected: list):
+    parsed = zparse(pattern)
+    durations = []
+    for i in range(12):
+        durations.append(parsed[i].duration)
+    assert durations == expected
+
+@pytest.mark.parametrize(
+    "pattern,expected",
+    [
+      ("e 1 | 3 | h 3 | e3 | 4", [0.125,0.25,0.5,0.125,0.25])
+    ]
+)
+def test_measure_durations(pattern: str, expected: list):
+    assert get_items(zparse(pattern),len(expected)*2,"duration") == expected*2
+
+@pytest.mark.parametrize(
+    "pattern,expected",
+    [
+      ("^ 1 | _ 3 | ^3 | 3 | _4", [1,-1,1,0,-1])
+    ]
+)
+def test_measure_octaves(pattern: str, expected: list):
+    assert get_items(zparse(pattern),len(expected)*2,"octave") == expected*2
+
+@pytest.mark.parametrize(
+    "pattern,expected",
+    [
+      ("e r qr r q r", [0.125, 0.25, 0.125, 0.25])
+    ]
+)
+def test_rest(pattern: str, expected: list):
+    assert get_items(zparse(pattern),len(expected)*2,"duration") == expected*2
+
+@pytest.mark.parametrize(
+    "pattern,expected",
+    [
+      ("-3..9 1..9", [55, 57, 59, 60, 62, 64, 65, 67, 69, 71, 72, 74, 76, 62, 64, 65, 67, 69, 71, 72, 74, 76])
+    ]
+)
+def test_ranges(pattern: str, expected: list):
+    assert get_items(zparse(pattern),len(expected)*2,"note") == expected*2
+
+@pytest.mark.parametrize(
+    "pattern,expected",
+    [
+      ("0 1 2 3", [None, 60, 62, 64])
+    ]
+)
+def test_degree_notation(pattern: str, expected: list):
+    assert get_items(zparse(pattern, degrees=True),len(expected)*2,"note") == expected*2
+
+@pytest.mark.parametrize(
+    "pattern,expected",
+    [
+      ("i ii iii iv v vi vii", [[60, 64, 67], [62, 65, 69], [64, 67, 71], [65, 69, 72], [67, 71, 74], [69, 72, 76], [71, 74, 77]])
+    ]
+)
+def test_romans(pattern: str, expected: list):
+    assert get_items(zparse(pattern),len(expected)*2,"note") == expected*2
+
+@pytest.mark.parametrize(
+    "pattern,expected",
+    [
+      ("[: i vi v :]", [[0, 2, 4], [5, 0, 2], [4, 6, 1], [0, 2, 4], [5, 0, 2], [4, 6, 1]]),
+      ("i ii iii iv v vi vii", [[0, 2, 4], [1, 3, 5], [2, 4, 6], [3, 5, 0], [4, 6, 1], [5, 0, 2], [6, 1, 3]]),
+      ("i^7 i^min iv^6", [[0, 2, 4, 6], [0, 2, 4], [3, 5, 0, 1]])
+    ]
+)
+def test_romans_pcs(pattern: str, expected: list):
+    assert get_items(zparse(pattern),len(expected)*2,"pitches") == expected*2
+
+@pytest.mark.parametrize(
+    "pattern,expected",
+    [
+      ("(0 1 2 3 r)+(1)", [1,2,3,4,None]),
+      ("(0 1 2 3 r)-(0 1 4)", [0, -1, -2, -3, None, 1, 0, -1, -2, None, 4, 3, 2, 1, None])
+    ]
+)
+def test_operations(pattern: str, expected: list):
+    assert get_items(zparse(pattern),len(expected)*2,"pitch_class") == expected*2
+
+@pytest.mark.parametrize(
+    "pattern,expected",
+    [
+     ("(i)+<0 1 2>", [[60, 64, 67], [62, 65, 69], [64, 67, 71], [60, 64, 67]]),
+     ("(i)+<0 <1 2>>",[[60, 64, 67], [62, 65, 69], [60, 64, 67], [64, 67, 71]])
+    ]
+)
+def test_cycles(pattern: str, expected: list):
+    zparse.cache_clear() # Clear cache for cycles
+    assert get_items(zparse(pattern),4,"note") == expected
--- a/ziffers/init.py
+++ b/ziffers/init.py
@ -1,6 +1,9 @@
 from .parser import *
 from .mapper import *
-from .classes import *
 from .common import *
 from .defaults import *
 from .scale import *
+from .converters import *
+from .spec import *
+from .classes import *
+from .generators import *
--- a/ziffers/classes.py
+++ b/ziffers/classes.py
@ -1,676 +0,0 @@
-""" Ziffers classes for the parsed notation """
-from dataclasses import dataclass, field, replace
-import itertools
-import operator
-import random
-from .defaults import DEFAULT_OPTIONS
-from .scale import note_from_pc, midi_to_pitch_class
-
-
-@dataclass(kw_only=True)
-class Meta:
-    """Abstract class for all Ziffers items"""
-
-    kwargs: dict = field(default=None, repr=False)
-
-    def __post_init__(self):
-        if self.kwargs:
-            for key, val in self.kwargs.items():
-                setattr(self, key, val)
-
-    def update(self, new_values):
-        """Update attributes from dict"""
-        for key, value in new_values.items():
-            if hasattr(self, key):
-                setattr(self, key, value)
-
-    def update_new(self, new_values):
-        """Updates new attributes from dict"""
-        for key, value in new_values.items():
-            if hasattr(self, key):
-                if getattr(self, key) is None:
-                    setattr(self, key, value)
-
-
-@dataclass(kw_only=True)
-class Item(Meta):
-    """Class for all Ziffers text based items"""
-
-    text: str = field(default=None)
-
-    def get_item(self):
-        """Return the item"""
-        return self
-
-
-@dataclass(kw_only=True)
-class Whitespace:
-    """Class for whitespace"""
-
-    text: str
-    item_type: str = field(default=None, repr=False, init=False)
-
-    def get_item(self):
-        """Returns None. Used in filtering"""
-        return None
-
-
-@dataclass(kw_only=True)
-class DurationChange(Item):
-    """Class for changing duration"""
-
-    value: float
-    key: str = field(default="duration", repr=False, init=False)
-    item_type: str = field(default="change", repr=False, init=False)
-
-
-@dataclass
-class OctaveChange(Item):
-    """Class for changing octave"""
-
-    value: int
-    key: str = field(default="octave", repr=False, init=False)
-    item_type: str = field(default="change", repr=False, init=False)
-
-
-@dataclass(kw_only=True)
-class OctaveAdd(Item):
-    """Class for modifying octave"""
-
-    value: int
-    key: str = field(default="octave", repr=False, init=False)
-    item_type: str = field(default="add", repr=False, init=False)
-
-
-@dataclass(kw_only=True)
-class Event(Item):
-    """Abstract class for events with duration"""
-
-    duration: float = field(default=None)
-
-
-@dataclass(kw_only=True)
-class Pitch(Event):
-    """Class for pitch in time"""
-
-    pitch_class: int
-    octave: int = field(default=None)
-    modifier: int = field(default=0)
-    note: int = field(default=None)
-    key: str = field(default=None)
-    scale: str | list = field(default=None)
-
-    def __post_init__(self):
-        super().__post_init__()
-        if self.text is None:
-            self.text = str(self.pitch_class)
-            self.update_note()
-
-    def update_note(self):
-        """Update note if Key, Scale and Pitch-class is present"""
-        if (
-            (self.key is not None)
-            and (self.scale is not None)
-            and (self.pitch_class is not None)
-            and (self.note is None)
-        ):
-            note = note_from_pc(
-                root=self.key,
-                pitch_class=self.pitch_class,
-                intervals=self.scale,
-                modifier=self.modifier if self.modifier is not None else 0,
-                octave=self.octave if self.octave is not None else 0,
-            )
-            self.set_note(note)
-
-    def set_note(self, note: int) -> int:
-        """Sets a note for the pitch and returns the note.
-
-        Args:
-            note (int): Midi note
-
-        Returns:
-            int: Returns the saved note
-        """
-        self.note = note
-        return note
-
-    # pylint: disable=locally-disabled, unused-argument
-    def get_value(self) -> int:
-        """Returns the pitch class
-
-        Returns:
-            int: Integer value for the pitch
-        """
-        return self.pitch_class
-
-
-@dataclass(kw_only=True)
-class RandomPitch(Event):
-    """Class for random pitch"""
-
-    pitch_class: int = field(default=None)
-
-    # pylint: disable=locally-disabled, unused-argument
-    def get_value(self) -> int:
-        """Return random value
-
-        Returns:
-            int: Returns random pitch
-        """
-        return self.pitch_class
-
-
-@dataclass(kw_only=True)
-class RandomPercent(Item):
-    """Class for random percent"""
-
-    percent: float = field(default=None)
-
-
-@dataclass(kw_only=True)
-class Chord(Event):
-    """Class for chords"""
-
-    pitch_classes: list[Pitch] = field(default=None)
-    notes: list[int] = field(default=None)
-
-    def set_notes(self, notes: list[int]):
-        """Set notes to the class"""
-        self.notes = notes
-
-
-@dataclass(kw_only=True)
-class RomanNumeral(Event):
-    """Class for roman numbers"""
-
-    value: str = field(default=None)
-    chord_type: str = field(default=None)
-    notes: list[int] = field(default_factory=[])
-    pitch_classes: list = None
-
-    def set_notes(self, chord_notes: list[int]):
-        """Set notes to roman numeral
-
-        Args:
-            chord_notes (list[int]): List of notes in midi to be added
-        """
-        self.notes = chord_notes
-
-    def set_pitch_classes(self, pitches: list[tuple]):
-        """Set pitch classes to roman numeral
-
-        Args:
-            pitches (list[tuple]): Pitch classes to be added
-        """
-        if self.pitch_classes is None:
-            self.pitch_classes = []
-        for pitch in pitches:
-            self.pitch_classes.append(Pitch(**pitch))
-
-
-@dataclass(kw_only=True)
-class Function(Event):
-    """Class for functions"""
-
-    run: str = field(default=None)
-
-
-@dataclass(kw_only=True)
-class Sequence(Meta):
-    """Class for sequences of items"""
-
-    values: list
-    text: str = field(default=None)
-    wrap_start: str = field(default=None, repr=False)
-    wrap_end: str = field(default=None, repr=False)
-    local_index: int = field(default=0, init=False)
-    evaluation: bool = field(default=False, init=False)
-
-    def __post_init__(self):
-        super().__post_init__()
-        self.text = self.__collect_text()
-
-    def __getitem__(self, index):
-        return self.values[index]
-
-    def update_values(self, new_values):
-        """Update value attributes from dict"""
-        for key, value in new_values.items():
-            for obj in self.values:
-                if key != "text" and hasattr(obj, key):
-                    setattr(obj, key, value)
-
-    def __collect_text(self) -> str:
-        """Collect text value from values"""
-        text = "".join([val.text for val in self.values])
-        if self.wrap_start is not None:
-            text = self.wrap_start + text
-        if self.wrap_end is not None:
-            text = text + self.wrap_end
-        return text
-
-    def evaluate_tree(self, options=None):
-        """Evaluates and flattens the Ziffers object tree"""
-        for item in self.values:
-            if isinstance(item, Sequence):
-                if item.evaluation:
-                    yield from item.evaluate(options)
-                else:
-                    yield from item.evaluate_tree(options)
-            else:
-                # Get value / generated value from the item
-                current = item.get_item()
-                # Ignore items that returns None
-                if current is not None:
-                    if isinstance(current, (DurationChange, OctaveChange, OctaveAdd)):
-                        options = self.__update_options(current, options)
-                    else:
-                        if set(("key", "scale")) <= options.keys():
-                            if isinstance(current, Cyclic):
-                                current = current.get_value()
-                            if isinstance(current, (Pitch, RandomPitch, RandomInteger)):
-                                current = self.__update_pitch(current, options)
-                            elif isinstance(current, Chord):
-                                current = self.__update_chord(current, options)
-                            elif isinstance(current, RomanNumeral):
-                                current = self.__create_chord_from_roman(
-                                    current, options
-                                )
-                        current.update_new(options)
-                        yield current
-
-    def filter(self, keep: tuple):
-        """Filter out items from sequence.
-
-        Args:
-            keep (tuple): Tuple describing classes to keep
-
-        Returns:
-            Sequence: Copy of the sequence with filtered values.
-        """
-        return replace(
-            self, values=[item for item in self.values if isinstance(item, keep)]
-        )
-
-    def __update_options(self, current: Item, options: dict) -> dict:
-        """Update options based on current item
-
-        Args:
-            current (Item): Current item like Duration change, Octave change etc.
-            options (dict): Current options
-
-        Returns:
-            dict: Updated options
-        """
-        if current.item_type == "change":  # Change options
-            options[current.key] = current.value
-        elif current.item_type == "add":
-            if current.key in options:  # Add to existing value
-                options[current.key] += current.value
-            else:  # Create value if not existing
-                options[current.key] = current.value
-        return options
-
-    def __update_pitch(self, current: Item, options: dict) -> dict:
-        """Update pich based on optons
-
-        Args:
-            current (Item): _description_
-            options (dict): _description_
-
-        Returns:
-            dict: _description_
-        """
-        if hasattr(current, "modifier"):
-            c_modifier = 0
-        elif "modifier" in options:
-            c_modifier = options["modifier"]
-        else:
-            c_modifier = 0
-
-        if hasattr(current, "octave"):
-            c_octave = 0
-        elif "octave" in options:
-            c_octave = options["octave"]
-        else:
-            c_octave = 0
-
-        note = note_from_pc(
-            root=options["key"],
-            pitch_class=current.get_value(),
-            intervals=options["scale"],
-            modifier=c_modifier,
-            octave=c_octave,
-        )
-        new_pitch = Pitch(
-            pitch_class=current.get_value(),
-            text=str(current.get_value()),
-            note=note,
-            octave=c_octave,
-            modifier=c_modifier,
-            kwargs=options,
-        )
-        return new_pitch
-
-    def __update_chord(self, current: Chord, options: dict) -> Chord:
-        """Update chord based on options
-
-        Args:
-            current (Chord): Current chord object
-            options (dict): Options
-            re (bool, optional): Re-evaluation flag. Defaults to False.
-
-        Returns:
-            Chord: Returns updated chord
-        """
-        pcs = current.pitch_classes
-        notes = [
-            pc.set_note(note_from_pc(options["key"], pc.pitch_class, options["scale"]))
-            for pc in pcs
-        ]
-        current.set_notes(notes)
-        return current
-
-    def __create_chord_from_roman(self, current: RomanNumeral, options: dict) -> Chord:
-        """Create chord fom roman numeral
-
-        Args:
-            current (RomanNumeral): Current roman numeral
-            options (dict): Options
-            re (bool, optional): Re-evaluation flag. Defaults to False.
-
-        Returns:
-            Chord: New chord created from Roman numeral
-        """
-        key = options["key"]
-        scale = options["scale"]
-        pitches = [midi_to_pitch_class(note, key, scale) for note in current.notes]
-        chord_notes = [
-            note_from_pc(
-                root=key,
-                pitch_class=pitch,
-                intervals=scale,
-                modifier=current.modifier if hasattr(current, "modifier") else 0,
-            )
-            for pitch in pitches
-        ]
-        chord = Chord(text="".join(pitches), pitch_classes=pitches, notes=chord_notes)
-        return chord
-
-
-@dataclass(kw_only=True)
-class Ziffers(Sequence):
-    """Main class for holding options and the current state"""
-
-    options: dict = field(default_factory=DEFAULT_OPTIONS)
-    loop_i: int = 0
-    iterator = None
-    current: Item = field(default=None)
-
-    def __iter__(self):
-        return self
-
-    def __next__(self):
-        self.current = next(self.iterator)
-        self.loop_i += 1
-        return self.current
-
-    # pylint: disable=locally-disabled, dangerous-default-value
-    def init_opts(self, options=None):
-        """Evaluate the Ziffers tree using the options"""
-        self.options.update(DEFAULT_OPTIONS)
-        if options:
-            self.options.update(options)
-        else:
-            self.options = DEFAULT_OPTIONS
-
-        self.iterator = iter(self.evaluate_tree(self.options))
-
-    def re_eval(self, options=None):
-        """Re-evaluate the iterator"""
-        self.options.update(DEFAULT_OPTIONS)
-        if options:
-            self.options.update(options)
-        self.iterator = iter(self.evaluate_tree(self.options))
-
-    def get_list(self):
-        """Return list"""
-        return list(self)
-
-    def take(self, num: int) -> list[Pitch]:
-        """Take number of pitch classes from the parsed sequence. Cycles from the beginning.
-
-        Args:
-            num (int): Number of pitch classes to take from the sequence
-
-        Returns:
-            list: List of pitch class items
-        """
-        return list(itertools.islice(itertools.cycle(self), num))
-
-    def loop(self) -> iter:
-        """Return cyclic loop"""
-        return itertools.cycle(iter(self))
-
-    def set_defaults(self, options: dict):
-        """Sets options for the parser
-
-        Args:
-            options (dict): Options as a dict
-        """
-        self.options = DEFAULT_OPTIONS | options
-
-    # TODO: Refactor these
-    def pitch_classes(self) -> list[int]:
-        """Return list of pitch classes as ints"""
-        return [val.pitch_class for val in self.values if isinstance(val, Pitch)]
-
-    def durations(self) -> list[float]:
-        """Return list of pitch durations as floats"""
-        return [val.dur for val in self.values if isinstance(val, Pitch)]
-
-    def pairs(self) -> list[tuple]:
-        """Return list of pitches and durations"""
-        return [
-            (val.pitch_class, val.dur) for val in self.values if isinstance(val, Pitch)
-        ]
-
-    def octaves(self) -> list[int]:
-        """Return list of octaves"""
-        return [val.octave for val in self.values if isinstance(val, Pitch)]
-
-
-@dataclass(kw_only=True)
-class ListSequence(Sequence):
-    """Class for Ziffers list sequences"""
-
-    wrap_start: str = field(default="(", repr=False)
-    wrap_end: str = field(default=")", repr=False)
-
-
-@dataclass(kw_only=True)
-class Integer(Item):
-    """Class for integers"""
-
-    value: int
-
-    # pylint: disable=locally-disabled, unused-argument
-    def get_value(self):
-        """Return value of the integer"""
-        return self.value
-
-
-@dataclass(kw_only=True)
-class RandomInteger(Item):
-    """Class for random integer"""
-
-    min: int
-    max: int
-
-    def __post_init__(self):
-        super().__post_init__()
-        if self.min > self.max:
-            new_max = self.min
-            self.min = self.max
-            self.max = new_max
-
-    # pylint: disable=locally-disabled, unused-argument
-    def get_value(self):
-        """Evaluate the random value for the generator"""
-        return random.randint(self.min, self.max)
-
-
-@dataclass(kw_only=True)
-class RepeatedListSequence(Sequence):
-    """Class for Ziffers list sequences"""
-
-    repeats: RandomInteger | Integer = field(default_factory=Integer(value=1, text="1"))
-    wrap_start: str = field(default="(:", repr=False)
-    wrap_end: str = field(default=":)", repr=False)
-
-
-@dataclass(kw_only=True)
-class Subdivision(Item):
-    """Class for subdivisions"""
-
-    values: list[Event]
-
-
-@dataclass(kw_only=True)
-class Cyclic(Item):
-    """Class for cyclic sequences"""
-
-    values: list
-    cycle: int = 0
-    wrap_start: str = field(default="<", repr=False)
-    wrap_end: str = field(default=">", repr=False)
-
-    def __post_init__(self):
-        super().__post_init__()
-        self.text = self.__collect_text()
-        self.values = [val for val in self.values if not isinstance(val, Whitespace)]
-
-    def __collect_text(self) -> str:
-        """Collect text value from values"""
-        text = "".join([val.text for val in self.values])
-        if self.wrap_start is not None:
-            text = self.wrap_start + text
-        if self.wrap_end is not None:
-            text = text + self.wrap_end
-        return text
-
-    def get_value(self):
-        """Get the value for the current cycle"""
-        value = self.values[self.cycle % len(self.values)]
-        self.cycle += 1
-        return value
-
-
-@dataclass(kw_only=True)
-class Range(Item):
-    """Class for range"""
-
-    start: int = field(default=None)
-    end: int = field(default=None)
-
-
-@dataclass(kw_only=True)
-class Operator(Item):
-    """Class for math operators"""
-
-    value: ...
-
-
-@dataclass(kw_only=True)
-class ListOperation(Sequence):
-    """Class for list operations"""
-
-    def __post_init__(self):
-        super().__post_init__()
-        self.evaluation = True
-
-    def filter_operation(self, values):
-        """Filtering for the operation elements"""
-        keep = (Sequence, Event, RandomInteger, Integer, Cyclic)
-        for item in values:
-            if isinstance(item, Sequence):
-                yield item.filter(keep)
-            elif isinstance(item, keep):
-                yield item
-
-    def evaluate(self, options: dict):
-        """Evaluates the operation"""
-        operators = self.values[1::2]  # Fetch every second operator element
-        values = self.values[::2]  # Fetch every second list element
-        values = list(self.filter_operation(values))  # Filter out crap
-        result = values[0]  # Start results with the first array
-        for i, operand in enumerate(operators):
-            operation = operand.value
-            right_value = values[i + 1]
-            if isinstance(right_value, Sequence):
-                result = [
-                    Pitch(
-                        pitch_class=operation(x.get_value(), y.get_value()),
-                        kwargs=options,
-                    )
-                    for x in result
-                    for y in right_value
-                ]
-            else:
-                result = [
-                    Pitch(
-                        pitch_class=operation(x.get_value(), right_value.get_value()),
-                        kwargs=options,
-                    )
-                    for x in result
-                ]
-        return Sequence(values=result)
-
-
-@dataclass(kw_only=True)
-class Operation(Item):
-    """Class for lisp-like operations: (+ 1 2 3) etc."""
-
-    values: list
-    operator: operator
-
-
-@dataclass(kw_only=True)
-class Eval(Sequence):
-    """Class for evaluation notation"""
-
-    result: ... = None
-    wrap_start: str = field(default="{", repr=False)
-    wrap_end: str = field(default="}", repr=False)
-
-    def __post_init__(self):
-        super().__post_init__()
-        self.result = eval(self.text)
-
-
-@dataclass(kw_only=True)
-class Atom(Item):
-    """Class for evaluable atoms"""
-
-    value: ...
-
-
-@dataclass(kw_only=True)
-class Euclid(Item):
-    """Class for euclidean cycles"""
-
-    pulses: int
-    length: int
-    onset: list
-    offset: list = field(default=None)
-    rotate: int = field(default=None)
-
-
-@dataclass(kw_only=True)
-class RepeatedSequence(Sequence):
-    """Class for repeats"""
-
-    repeats: RandomInteger | Integer = field(default_factory=Integer(value=1, text="1"))
-    wrap_start: str = field(default="[:", repr=False)
-    wrap_end: str = field(default=":]", repr=False)
--- a/ziffers/classes/init.py
+++ b/ziffers/classes/init.py
@ -0,0 +1,3 @@
+from .items import *
+from .root import *
+from .sequences import *
--- a/ziffers/classes/items.py
+++ b/ziffers/classes/items.py
@ -0,0 +1,645 @@
+""" Ziffers item classes """
+from dataclasses import dataclass, field, asdict
+from math import floor
+import random
+from ..scale import (
+    note_from_pc,
+    midi_to_pitch_class,
+    midi_to_freq,
+    get_scale_length,
+    chord_from_degree,
+)
+from ..common import repeat_text
+
+
+@dataclass(kw_only=True)
+class Meta:
+    """Abstract class for all Ziffers items"""
+
+    kwargs: dict = field(default=None, repr=False)
+    local_options: dict = field(default_factory=dict)
+
+    def __post_init__(self):
+        if self.kwargs:
+            self.update_options(self.kwargs)
+
+    def replace_options(self, new_values):
+        """Replaces attribute values from dict"""
+        for key, value in new_values.items():
+            if hasattr(self, key):
+                setattr(self, key, value)
+
+    def update_options(self, options):
+        """Updates attribute values only if value is None"""
+        merged_options = self.local_options | options
+        for key, value in merged_options.items():
+            if hasattr(self, key):
+                if key == "octave":
+                    local_value = self.local_options.get("octave", False)
+                    oct_change = self.local_options.get("octave_change", False)
+                    if oct_change:
+                        setattr(self, key, oct_change)
+                    elif local_value:
+                        setattr(self, key, value + local_value)
+                    elif getattr(self, key) is None:
+                        setattr(self, key, value)
+                elif getattr(self, key) is None:
+                    local_value = self.local_options.get(key, False)
+                    if local_value:
+                        value = local_value
+                    setattr(self, key, value)
+                    if key == "duration":
+                        setattr(self, "beat", value * 4)
+
+    def dict(self):
+        """Returns safe dict from the dataclass"""
+        return {k: str(v) for k, v in asdict(self).items()}
+
+
+@dataclass(kw_only=True)
+class Item(Meta):
+    """Class for all Ziffers text based items"""
+
+    text: str = field(default=None)
+    measure: int = field(default=0, init=False)
+
+    def get_updated_item(self, options: dict):
+        """Get updated item with replaced options
+
+        Args:
+            options (dict): Options as a dict
+
+        Returns:
+            Item: Returns updated item
+        """
+        self.replace_options(options)
+        return self
+
+    def get_options(self) -> dict:
+        """Return local options from item
+
+        Returns:
+            dict: Options as a dict
+        """
+        keys = ["octave", "modifier", "key", "scale", "duration"]
+        return {key: getattr(self, key) for key in keys if hasattr(self, key)}
+
+
+@dataclass(kw_only=True)
+class Whitespace:
+    """Class for whitespace"""
+
+    text: str
+
+
+@dataclass(kw_only=True)
+class Modification(Item):
+    """Superclass for pitch modifications"""
+
+    key: str
+    value: ...
+
+    def as_options(self):
+        """Return modification as a dict"""
+        return {self.key: self.value}
+
+
+@dataclass(kw_only=True)
+class DurationChange(Modification):
+    """Class for changing duration"""
+
+    value: float
+    key: str = field(default="duration", repr=False, init=False)
+
+
+@dataclass
+class OctaveChange(Modification):
+    """Class for changing octave"""
+
+    value: int
+    key: str = field(default="octave", repr=False, init=False)
+
+
+@dataclass(kw_only=True)
+class OctaveAdd(Modification):
+    """Class for modifying octave"""
+
+    value: int
+    key: str = field(default="octave", repr=False, init=False)
+
+
+@dataclass(kw_only=True)
+class Event(Item):
+    """Abstract class for events with duration"""
+
+    duration: float = field(default=None)
+    beat: float = field(default=None)
+
+    def get_duration(self):
+        """Getter for duration"""
+        return self.duration
+
+    def get_beat(self):
+        """Getter for beat"""
+        return self.beat
+
+
+@dataclass
+class Rest(Event):
+    """Class for rests"""
+
+    def get_note(self):
+        """Getter for note"""
+        return None
+
+    def get_freq(self):
+        """Getter for freq"""
+        return None
+
+    def get_octave(self):
+        """Getter for octave"""
+        return None
+
+    def get_pitch_class(self):
+        """Getter for pitche"""
+        return None
+    
+    def get_pitch_bend(self):
+        """Getter for pitche"""
+        return None
+
+
+@dataclass
+class Measure(Item):
+    """Class for measures/bars. Used to reset default options."""
+
+    text: str = field(default="|", init=False)
+
+    def reset_options(self, options: dict):
+        """Reset options when measure changes"""
+        next_measure = options.get("measure", 0) + 1
+        start_options = options["start_options"].copy()
+        options.clear()
+        options.update(start_options)
+        options["measure"] = next_measure
+        options["start_options"] = start_options.copy()
+        self.measure = next_measure
+
+
+@dataclass(kw_only=True)
+class Pitch(Event):
+    """Class for pitch in time"""
+
+    pitch_class: int
+    pitch_bend: int = field(default=None)
+    octave: int = field(default=None)
+    modifier: int = field(default=None)
+    note: int = field(default=None)
+    key: str = field(default=None)
+    scale: str | list = field(default=None)
+    freq: float = field(default=None)
+    degrees: bool = field(default=None)
+
+    def __post_init__(self):
+        super().__post_init__()
+        if self.text is None:
+            self.text = str(self.pitch_class)
+            self.update_note()
+            # self._update_text()
+
+    def _update_text(self):
+        if self.octave is not None:
+            self.text = repeat_text("^", "_", self.octave) + self.text
+        if self.modifier is not None:
+            self.text = repeat_text("#", "b", self.modifier) + self.text
+
+    def get_note(self):
+        """Getter for note"""
+        return self.note
+
+    def get_freq(self):
+        """Getter for freq"""
+        return self.freq
+
+    def get_octave(self):
+        """Getter for octave"""
+        return self.octave
+    
+    def get_beat(self):
+        """Getter for beat"""
+        return self.beat
+
+    def get_pitch_class(self):
+        """Getter for pitche"""
+        return self.pitch_class
+    
+    def get_pitch_bend(self):
+        """Getter for pitche"""
+        return self.pitch_bend
+
+    def update_note(self, force: bool = False):
+        """Update note if Key, Scale and Pitch-class are present"""
+        if (
+            (self.key is not None)
+            and (self.scale is not None)
+            and (self.pitch_class is not None)
+            and (self.note is None or force)
+        ):
+            note, pitch_bend = note_from_pc(
+                root=self.key,
+                pitch_class=self.pitch_class,
+                intervals=self.scale,
+                modifier=self.modifier if self.modifier is not None else 0,
+                octave=self.octave if self.octave is not None else 0,
+                degrees=self.degrees
+            )
+            self.pitch_bend = pitch_bend
+            self.freq = midi_to_freq(note)
+            self.note = floor(note)
+        if self.duration is not None:
+            self.beat = self.duration * 4
+
+    def check_note(self, options: dict):
+        """Check for note modification"""
+        if "key" in options and self.key is not options["key"]:
+            self.key = options["key"]
+            edit = True
+        if "scale" in options and self.scale is not options["scale"]:
+            self.scale = options["scale"]
+            edit = True
+        if edit:
+            self.update_note(True)
+
+    def set_note(self, note: int) -> int:
+        """Sets a note for the pitch and returns the note.
+
+        Args:
+            note (int): Midi note
+
+        Returns:
+            int: Returns the saved note
+        """
+        self.note = note
+        return note
+
+    def set_freq(self, freq: float):
+        """Set frequency for the pitch object"""
+        self.freq = freq
+
+    # pylint: disable=locally-disabled, unused-argument
+    def get_value(self, options) -> int:
+        """Returns the pitch class
+
+        Returns:
+            int: Integer value for the pitch
+        """
+        return self.pitch_class
+
+
+@dataclass(kw_only=True)
+class RandomPitch(Event):
+    """Class for random pitch"""
+
+    pitch_class: int = field(default=None)
+
+    def get_value(self, options: dict) -> int:
+        """Return random value
+
+        Returns:
+            int: Returns random pitch
+        """
+        if options:
+            scale = options["scale"]
+            if isinstance(scale, str):
+                scale_length = get_scale_length(options.get("scale", "Major"))
+            else:
+                scale_length = len(scale)
+        else:
+            scale_length = 9
+
+        return random.randint(0, scale_length)
+
+
+@dataclass(kw_only=True)
+class RandomPercent(Item):
+    """Class for random percent"""
+
+    percent: float = field(default=None)
+
+
+@dataclass(kw_only=True)
+class Chord(Event):
+    """Class for chords"""
+
+    pitch_classes: list[Pitch] = field(default=None)
+    notes: list[int] = field(default=None)
+    inversions: int = field(default=None)
+    pitches: list[int] = field(default=None, init=False)
+    pitch_bends: list[int] = field(default=None, init=False)
+    freqs: list[float] = field(default=None, init=False)
+    octaves: list[int] = field(default=None, init=False)
+    durations: list[float] = field(default=None, init=False)
+    beats: list[float] = field(default=None, init=False)
+
+    def __post_init__(self):
+        if self.inversions is not None:
+            self.invert(self.inversions)
+
+    @property
+    def note(self):
+        """Synonym for notes"""
+        return self.notes
+
+    def set_notes(self, notes: list[int]):
+        """Set notes to the class"""
+        self.notes = notes
+
+    def get_note(self):
+        """Getter for  notes"""
+        return self.notes
+
+    def get_freq(self):
+        """Getter for  freqs"""
+        return self.freqs
+
+    def get_octave(self):
+        """Getter for  octaves"""
+        return self.octaves
+
+    def get_beat(self):
+        """Getter for  beats"""
+        return self.beats
+
+    def get_pitch_class(self):
+        """Getter for  pitches"""
+        return self.pitches
+    
+    def get_pitch_bend(self):
+        """Getter for pitche"""
+        return self.pitch_bends
+
+    def get_duration(self):
+        """Getter for  durations"""
+        return self.durations
+
+    def invert(self, value: int):
+        """Chord inversion"""
+        new_pitches = (
+            list(reversed(self.pitch_classes)) if value < 0 else self.pitch_classes
+        )
+        for _ in range(abs(value)):
+            new_pitch = new_pitches[_ % len(new_pitches)]
+            if not new_pitch.local_options.get("octave"):
+                new_pitch.local_options["octave"] = 0
+            new_pitch.local_options["octave"] += -1 if value <= 0 else 1
+
+        self.pitch_classes = new_pitches
+
+    def update_notes(self, options=None):
+        """Update notes"""
+        pitches, pitch_bends, notes, freqs, octaves, durations, beats = ([] for _ in range(7))
+
+        # Update notes
+        for pitch in self.pitch_classes:
+            if options is not None:
+                pitch.update_options(options)
+            pitch.update_note(True)
+
+        # Sort by generated notes
+        self.pitch_classes = sorted(self.pitch_classes, key=lambda x: x.note)
+
+        # Create helper lists
+        for pitch in self.pitch_classes:
+            pitches.append(pitch.pitch_class)
+            pitch_bends.append(pitch.pitch_bend)
+            notes.append(pitch.note)
+            freqs.append(pitch.freq)
+            octaves.append(pitch.octave)
+            durations.append(pitch.duration)
+            beats.append(pitch.beat)
+
+        self.pitches = pitches
+        self.pitch_bends = pitch_bends
+        self.notes = notes
+        self.freqs = freqs
+        self.octaves = octaves
+        self.durations = durations
+        self.duration = durations[0]
+        self.beats = beats
+        self.text = "".join([val.text for val in self.pitch_classes])
+
+
+@dataclass(kw_only=True)
+class RomanNumeral(Event):
+    """Class for roman numbers"""
+
+    value: str = field(default=None)
+    chord_type: str = field(default=None)
+    notes: list[int] = field(default=None, init=False)
+    pitch_classes: list = field(default=None, init=False)
+    inversions: int = field(default=None)
+    evaluated_chord: Chord = None
+    
+    def set_notes(self, chord_notes: list[int]):
+        """Set notes to roman numeral
+
+        Args:
+            chord_notes (list[int]): List of notes in midi to be added
+        """
+        self.notes = chord_notes
+
+    def set_pitch_classes(self, pitches: list[tuple]):
+        """Set pitch classes to roman numeral
+
+        Args:
+            pitches (list[tuple]): Pitch classes to be added
+        """
+        if self.pitch_classes is None:
+            self.pitch_classes = []
+        for pitch in pitches:
+            self.pitch_classes.append(Pitch(**pitch))
+
+    def evaluate_chord(self, options: dict) -> Chord:
+        """Create chord fom roman numeral"""
+        key = options["key"]
+        scale = options["scale"]
+        pitch_text = ""
+        pitch_classes = []
+        self.notes = chord_from_degree(
+            self.value, self.chord_type, options["scale"], options["key"]
+        )
+        for note in self.notes:
+            pitch_dict = midi_to_pitch_class(note, key, scale)
+            pitch_classes.append(
+                Pitch(
+                    pitch_class=pitch_dict["pitch_class"],
+                    note=note,
+                    freq=midi_to_freq(note),
+                    kwargs=(options | pitch_dict),
+                )
+            )
+            pitch_text += pitch_dict["text"]
+
+        chord = Chord(
+            text=pitch_text,
+            pitch_classes=pitch_classes,
+            duration=options["duration"],
+            notes=self.notes,
+            kwargs=options,
+            inversions=self.inversions,
+        )
+
+        chord.update_notes(options)
+
+        self.evaluated_chord = chord
+
+        return chord
+
+
+@dataclass(kw_only=True)
+class Function(Event):
+    """Class for functions"""
+
+    run: ... = field(default=None)
+
+
+@dataclass(kw_only=True)
+class FunctionList(Event):
+    """Class for functions"""
+
+    values: list
+
+
+@dataclass(kw_only=True)
+class VariableAssignment(Item):
+    """Class for defining variables"""
+
+    variable: str
+    value: Item
+    pre_eval: bool
+
+
+@dataclass(kw_only=True)
+class Variable(Event):
+    """Class for using variables"""
+
+    name: str
+
+
+@dataclass(kw_only=True)
+class Sample(Event):
+    """Class for samples"""
+
+    name: str
+
+@dataclass(kw_only=True)
+class SampleList(Event):
+    """Class for using multiple samples"""
+
+    values: list
+
+@dataclass(kw_only=True)
+class VariableList(Item):
+    """Class for using variables"""
+
+    values: list
+
+
+@dataclass(kw_only=True)
+class Integer(Item):
+    """Class for integers"""
+
+    value: int
+
+    # pylint: disable=locally-disabled, unused-argument
+    def get_value(self, options):
+        """Return value of the integer"""
+        return self.value
+
+
+@dataclass(kw_only=True)
+class RandomInteger(Item):
+    """Class for random integer"""
+
+    min: int
+    max: int
+
+    def __post_init__(self):
+        super().__post_init__()
+        if self.min > self.max:
+            new_max = self.min
+            self.min = self.max
+            self.max = new_max
+
+    # pylint: disable=locally-disabled, unused-argument
+    def get_value(self, options: dict = None):
+        """Evaluate the random value for the generator"""
+        return random.randint(self.min, self.max)
+
+
+@dataclass(kw_only=True)
+class Cyclic(Item):
+    """Class for cyclic sequences"""
+
+    values: list
+    cycle: int = 0
+    wrap_start: str = field(default="<", repr=False)
+    wrap_end: str = field(default=">", repr=False)
+
+    def __post_init__(self):
+        super().__post_init__()
+        self.text = self.__collect_text()
+        self.values = [val for val in self.values if not isinstance(val, Whitespace)]
+
+    def __collect_text(self) -> str:
+        """Collect text value from values"""
+        text = "".join([val.text for val in self.values])
+        if self.wrap_start is not None:
+            text = self.wrap_start + text
+        if self.wrap_end is not None:
+            text = text + self.wrap_end
+        return text
+
+    def get_value(self, options=None):
+        """Get the value for the current cycle"""
+        value = self.values[self.cycle % len(self.values)]
+        self.cycle += 1
+        if options:
+            value.update_options(options)
+        return value
+
+
+@dataclass(kw_only=True)
+class Range(Item):
+    """Class for range"""
+
+    start: int = field(default=None)
+    end: int = field(default=None)
+
+    def evaluate(self, options):
+        """Evaluates range and generates a generator of Pitches"""
+        merged_options = options | self.local_options
+        if options["octave"]:
+            merged_options["octave"] += options["octave"]
+        if self.start < self.end:
+            for i in range(self.start, self.end + 1):
+                yield Pitch(pitch_class=i, kwargs=merged_options)
+        elif self.start > self.end:
+            for i in reversed(range(self.end, self.start + 1)):
+                yield Pitch(pitch_class=i, kwargs=merged_options)
+        else:
+            yield Pitch(pitch_class=self.start, kwargs=merged_options)
+
+
+@dataclass(kw_only=True)
+class Operator(Item):
+    """Class for math operators"""
+
+    value: ...
+
+
+@dataclass(kw_only=True)
+class Atom(Item):
+    """Class for evaluable atoms"""
+
+    value: ...
--- a/ziffers/classes/root.py
+++ b/ziffers/classes/root.py
@ -0,0 +1,205 @@
+"""Root class for Ziffers object"""
+
+from dataclasses import dataclass, field
+from itertools import islice, cycle
+from ..defaults import DEFAULT_OPTIONS
+from .items import Item, Pitch, Chord, Event, Rest
+from .sequences import Sequence, Subdivision
+
+
+@dataclass(kw_only=True)
+class Ziffers(Sequence):
+    """Main class for holding options and the current state"""
+
+    options: dict = field(default_factory=DEFAULT_OPTIONS.copy())
+    start_options: dict = None
+    loop_i: int = field(default=0, init=False)
+    cycle_i: int = field(default=0, init=False)
+    iterator = None
+    current: Item = field(default=None)
+    cycle_length: int = field(default=0, init=False)
+
+    def __getitem__(self, index):
+        self.loop_i = index % self.cycle_length
+        new_cycle = index // self.cycle_length
+        # Re-evaluate if the prior loop has ended
+        if new_cycle > self.cycle_i or new_cycle < self.cycle_i:
+            self.re_eval()
+            self.cycle_i = new_cycle
+            self.cycle_length = len(self.evaluated_values)
+            self.loop_i = index % self.cycle_length
+        return self.evaluated_values[self.loop_i]
+
+    def __len__(self):
+        return len(self.evaluated_values)
+
+    def __iter__(self):
+        return self
+
+    def __next__(self):
+        self.current = next(self.iterator)
+        self.loop_i += 1
+        return self.current
+
+    # pylint: disable=locally-disabled, dangerous-default-value
+    def init_opts(self, options=None):
+        """Evaluate the Ziffers tree using the options"""
+        self.options.update(DEFAULT_OPTIONS.copy())
+        if options:
+            self.options.update(options)
+        else:
+            self.options = DEFAULT_OPTIONS.copy()
+
+        self.start_options = self.options.copy()
+        self.options["start_options"] = self.start_options
+        self.init_tree(self.options)
+
+    def re_eval(self):
+        """Re-evaluate the iterator"""
+        self.options = self.start_options.copy()
+        self.options["start_options"] = self.start_options
+        self.init_tree(self.options)
+
+    def init_tree(self, options):
+        """Initialize evaluated values and perform post-evaluation"""
+        self.evaluated_values = list(self.evaluate_tree(options))
+        self.evaluated_values = list(self.post_evaluation())
+        self.iterator = iter(self.evaluated_values)
+        self.cycle_length = len(self.evaluated_values)
+
+    def post_evaluation(self):
+        """Post-evaluation performs evaluation that can only be done after initial evaluation"""
+        for item in self.evaluated_values:
+            if isinstance(item, Subdivision):
+                yield from item.evaluate_durations()
+            else:
+                yield item
+
+    def get_list(self):
+        """Return list"""
+        return list(self)
+
+    def take(self, num: int) -> list[Pitch]:
+        """Take number of pitch classes from the parsed sequence. Cycles from the beginning.
+
+        Args:
+            num (int): Number of pitch classes to take from the sequence
+
+        Returns:
+            list: List of pitch class items
+        """
+        return list(islice(cycle(self), num))
+
+    def loop(self) -> iter:
+        """Return cyclic loop"""
+        return cycle(iter(self))
+
+    def set_defaults(self, options: dict):
+        """Sets options for the parser
+
+        Args:
+            options (dict): Options as a dict
+        """
+        self.options = DEFAULT_OPTIONS.copy() | options
+
+    def pitch_classes(self) -> list[int]:
+        """Return list of pitch classes as ints"""
+        return [
+            val.get_pitch_class()
+            for val in self.evaluated_values
+            if isinstance(val, (Pitch, Chord, Rest))
+        ]
+
+    def pitch_bends(self) -> list[int]:
+        """Return list of pitch bend values"""
+        return [
+            val.get_pitch_bend()
+            for val in self.evaluated_values
+            if isinstance(val, (Pitch, Chord, Rest))
+        ]
+
+    def notes(self) -> list[int]:
+        """Return list of midi notes"""
+        return [
+            val.get_note()
+            for val in self.evaluated_values
+            if isinstance(val, (Pitch, Chord, Rest))
+        ]
+
+    def durations(self) -> list[float]:
+        """Return list of pitch durations as floats"""
+        return [
+            val.get_duration()
+            for val in self.evaluated_values
+            if isinstance(val, Event)
+        ]
+
+    def total_duration(self) -> float:
+        """Return total duration"""
+        return sum(
+            [val.duration for val in self.evaluated_values if isinstance(val, Event)]
+        )
+
+    def total_beats(self) -> float:
+        """Return total beats"""
+        return sum(self.beats())
+
+    def beats(self) -> list[float]:
+        """Return list of pitch durations as floats"""
+        return [
+            val.get_beat() for val in self.evaluated_values if isinstance(val, Event)
+        ]
+
+    def pairs(self) -> list[tuple]:
+        """Return list of pitches and durations"""
+        return [
+            [val.get_pitch_class(), val.get_duration()]
+            for val in self.evaluated_values
+            if isinstance(val, Pitch) or isinstance(val, Chord) or isinstance(val, Rest)
+        ]
+    
+    def freq_pairs(self) -> list[tuple]:
+        """Return list of pitches in freq and durations"""
+        return [
+            [val.get_freq(), val.get_duration()]
+            for val in self.evaluated_values
+            if isinstance(val, Pitch) or isinstance(val, Chord) or isinstance(val, Rest)
+        ]
+
+    def octaves(self) -> list[int]:
+        """Return list of octaves"""
+        return [
+            val.get_octave()
+            for val in self.evaluated_values
+            if isinstance(val, (Pitch, Chord, Rest))
+        ]
+
+    def freqs(self) -> list[int]:
+        """Return list of octaves"""
+        return [
+            val.get_freq()
+            for val in self.evaluated_values
+            if isinstance(val, (Pitch, Chord, Rest))
+        ]
+
+    def collect(self, num: int = None, keys: str | list = None) -> list:
+        """Collect n items from parsed Ziffers"""
+        if num is None:
+            num = len(self.evaluated_values)
+        if keys is None or isinstance(keys, str):
+            keys = [keys]
+        all_items = []
+        values = []
+        for key in keys:
+            for i in range(num):
+                if key is not None:
+                    values.append(getattr(self[i], key, None))
+                else:
+                    values.append(self[i])
+            all_items.append(values)
+            values = []
+        if len(all_items) > 1:
+            return all_items
+        if len(all_items) == 1:
+            return all_items[0]
+        return None
--- a/ziffers/classes/sequences.py
+++ b/ziffers/classes/sequences.py
@ -0,0 +1,739 @@
+""" Sequence classes for Ziffers """
+from dataclasses import dataclass, field, replace
+from itertools import product
+from math import floor
+import random
+from types import LambdaType
+from copy import deepcopy
+import operator
+from ..defaults import DEFAULT_OPTIONS
+from ..common import cyclic_zip, euclidian_rhythm, flatten
+from ..scale import note_from_pc, midi_to_freq
+from .items import (
+    Meta,
+    Item,
+    Event,
+    DurationChange,
+    OctaveChange,
+    OctaveAdd,
+    Pitch,
+    Rest,
+    RandomPitch,
+    Chord,
+    RomanNumeral,
+    Cyclic,
+    RandomInteger,
+    Range,
+    Integer,
+    VariableAssignment,
+    Variable,
+    VariableList,
+    Measure,
+    Function,
+    Modification,
+    Whitespace,
+    Sample,
+    SampleList,
+)
+
+
+# TODO: Could be refactored to each class?
+def resolve_item(item: Meta, options: dict):
+    """Resolve cyclic value"""
+    if isinstance(item, Sequence):
+        if isinstance(item, ListOperation):
+            yield from item.evaluate(options)
+        elif isinstance(item, (RepeatedSequence, RepeatedListSequence)):
+            yield from item.resolve_repeat(options)
+        elif isinstance(item, Subdivision):
+            item.evaluate_values(options)
+            yield item
+        elif isinstance(item, Eval):
+            yield from item.evaluate_values(options)
+        else:
+            yield from item.evaluate_tree(options)
+    elif isinstance(item, VariableAssignment):
+        if item.pre_eval:
+            pre_options = options.copy()
+            pre_options["pre_eval"] = True
+            options[item.variable.name] = Sequence(
+                values=list(resolve_item(item.value, pre_options))
+            )
+        else:
+            options[item.variable.name] = item.value
+    elif isinstance(item, Variable):
+        if options[item.name]:
+            if item.name in options:
+                opt_item = options[item.name]
+                if isinstance(opt_item, LambdaType):
+                    yield Function(
+                        run=opt_item,
+                        text=item.text,
+                        kwargs=(options | item.local_options),
+                        local_options=item.local_options,
+                    )
+                elif isinstance(opt_item, str):
+                    yield Sample(
+                        name=opt_item,
+                        text=item.text,
+                        kwargs=(options | item.local_options),
+                        local_options=item.local_options,
+                    )
+                variable = deepcopy(opt_item)
+                yield from resolve_item(variable, options)
+    elif isinstance(item, VariableList):
+        seqlist = []
+        sample_list = True
+        for var in item.values:
+            if var.name in options:
+                opt_item = options[var.name]
+                if isinstance(opt_item, LambdaType):
+                    sample_list = False
+                    seqlist.append(
+                        Function(
+                            run=opt_item,
+                            text=var.text,
+                            kwargs=(options | var.local_options),
+                            local_options=var.local_options,
+                        )
+                    )
+                elif isinstance(opt_item, str):
+                    seqlist.append(
+                        Sample(
+                            name=opt_item,
+                            text=var.text,
+                            kwargs=(options | var.local_options),
+                            local_options=var.local_options,
+                        )
+                    )
+                elif isinstance(opt_item, Sequence):
+                    sample_list = False
+                    seqlist.append(opt_item)
+        if len(seqlist) > 0:
+            if sample_list:
+                yield SampleList(values=seqlist, kwargs=options)
+            else:
+                yield PolyphonicSequence(values=seqlist)
+    elif isinstance(item, Range):
+        yield from item.evaluate(options)
+    elif isinstance(item, Cyclic):
+        yield from resolve_item(item.get_value(), options)
+    elif isinstance(item, Euclid):
+        yield from euclidean_items(item, options)
+    elif isinstance(item, Modification):
+        update_modifications(item, options)
+    elif isinstance(item, Measure):
+        item.reset_options(options)
+    elif options["degrees"] is True and isinstance(item, Pitch) and item.pitch_class == 0:
+        yield Rest(text="r", kwargs=options)
+    elif isinstance(item, Meta):  # Filters whitespace
+        yield update_item(item, options)
+
+
+def resolve_integer_value(item, options):
+    """Helper for resolving integer value of different types"""
+    while isinstance(item, Cyclic):
+        item = item.get_value(options)
+    if isinstance(item, Pitch):
+        return item.get_value(options)
+    if isinstance(item, Integer):
+        return item.get_value(options)
+    return item
+
+
+def update_item(item, options):
+    """Update or create new pitch"""
+    if set(("key", "scale")) <= options.keys():
+        if isinstance(item, Pitch):
+            item.update_options(options)
+            item.update_note()
+            if options.get("pre_eval", False):
+                item.duration = options["duration"]
+        if isinstance(item, Rest):
+            item.update_options(options)
+        elif isinstance(item, (RandomPitch, RandomInteger)):
+            item = create_pitch(item, options)
+        elif isinstance(item, Chord):
+            item.update_options(options)
+            item.update_notes(options)
+        elif isinstance(item, RomanNumeral):
+            item = item.evaluate_chord(options)
+    return item
+
+
+def euclidean_items(euclid: Item, options: dict):
+    """Loops values from generated euclidean sequence"""
+    euclid.evaluate(options)
+    for item in euclid.evaluated_values:
+        yield from resolve_item(item, options)
+
+
+def update_modifications(current: Item, options: dict) -> dict:
+    """Update options based on current item"""
+    if isinstance(current, (OctaveChange, DurationChange)):
+        options[current.key] = current.value
+    elif isinstance(current, OctaveAdd):
+        if current.key in options:  # Add to existing value
+            options[current.key] += current.value
+        else:  # Create value if not existing
+            options[current.key] = current.value
+
+
+def create_pitch(current: Item, options: dict) -> Pitch:
+    """Create pitch based on values and options"""
+
+    merged_options = options | current.local_options
+
+    if "modifier" in merged_options:
+        c_modifier = merged_options["modifier"]
+    else:
+        c_modifier = 0
+
+    if hasattr(current, "modifier") and current.modifier is not None:
+        c_modifier += current.modifier
+
+    if "octave" in merged_options:
+        c_octave = merged_options["octave"]
+        if "octave" in options:
+            c_octave = options["octave"] + c_octave
+    else:
+        c_octave = 0
+
+    if hasattr(current, "octave") and current.octave is not None:
+        c_octave += current.octave
+
+    current_value = current.get_value(merged_options)
+
+    note, pitch_bend = note_from_pc(
+        root=merged_options["key"],
+        pitch_class=current_value,
+        intervals=merged_options["scale"],
+        modifier=c_modifier,
+        octave=c_octave,
+        degrees=merged_options["degrees"]
+    )
+    new_pitch = Pitch(
+        pitch_class=current_value,
+        text=str(current_value),
+        freq=midi_to_freq(note),
+        note=floor(note),
+        pitch_bend=pitch_bend,
+        octave=c_octave,
+        modifier=c_modifier,
+        kwargs=merged_options,
+    )
+    return new_pitch
+
+
+@dataclass(kw_only=True)
+class Sequence(Meta):
+    """Class for sequences of items"""
+
+    values: list
+    text: str = field(default=None)
+    wrap_start: str = field(default=None, repr=False)
+    wrap_end: str = field(default=None, repr=False)
+    local_index: int = field(default=0, init=False)
+    evaluated_values: list = field(default=None)
+
+    def __post_init__(self):
+        super().__post_init__()
+        self.text = self.__collect_text()
+        self.update_local_options()
+
+    def __getitem__(self, index):
+        return self.values[index]
+
+    def __len__(self):
+        return len(self.values)
+
+    def update_local_options(self):
+        """Update value attributes from dict"""
+        if self.local_options:
+            for obj in self.values:
+                if isinstance(obj, Event):
+                    if obj.local_options:
+                        obj.local_options = (
+                            obj.local_options | self.local_options.copy()
+                        )
+                    else:
+                        obj.local_options = self.local_options.copy()
+
+    def __collect_text(self) -> str:
+        """Collect text value from values"""
+        text = "".join([val.text for val in self.values])
+        if self.wrap_start is not None:
+            text = self.wrap_start + text
+        if self.wrap_end is not None:
+            text = text + self.wrap_end
+        return text
+
+    def evaluate_tree(self, options: dict = None, eval_tree: bool = False):
+        """Evaluate the tree and return array of resolved pitches
+
+        Args:
+            options (dict, optional): Options for the pitches. Defaults to None.
+            eval_tree (bool, optional): Flag for using the evaluated subtree. Defaults to False.
+        """
+
+        # Start of the main function: Evaluate and flatten the Ziffers object tree
+        values = self.evaluated_values if eval_tree else self.values
+        for item in values:
+            yield from resolve_item(item, options)
+
+    def filter(self, keep: tuple):
+        """Filter out items from sequence.
+
+        Args:
+            keep (tuple): Tuple describing classes to keep
+
+        Returns:
+            Sequence: Copy of the sequence with filtered values.
+        """
+        return replace(
+            self, values=[item for item in self.values if isinstance(item, keep)]
+        )
+
+
+@dataclass(kw_only=True)
+class PolyphonicSequence:
+    """Class for polyphonic sequence"""
+
+    values: list
+
+
+@dataclass(kw_only=True)
+class ListSequence(Sequence):
+    """Class for Ziffers list sequences"""
+
+    wrap_start: str = field(default="(", repr=False)
+    wrap_end: str = field(default=")", repr=False)
+
+
+@dataclass(kw_only=True)
+class RepeatedListSequence(Sequence):
+    """Class for Ziffers list sequences"""
+
+    repeats: RandomInteger | Integer = field(default_factory=Integer(value=1, text="1"))
+    wrap_start: str = field(default="(:", repr=False)
+    wrap_end: str = field(default=":)", repr=False)
+
+    def resolve_repeat(self, options: dict):
+        """Repeats items and generates new random values"""
+        repeats = self.repeats.get_value(options)
+        if not isinstance(repeats, int):
+            repeats = resolve_integer_value(repeats, options)
+        for _ in range(repeats):
+            for item in self.evaluate_tree(options):
+                yield from resolve_item(item, options)
+
+
+@dataclass(kw_only=True)
+class Subdivision(Sequence):
+    """Class for subdivisions"""
+
+    full_duration: float = field(default=None, init=False)
+
+    def evaluate_values(self, options):
+        """Evaluate values and store to evaluated_values"""
+        self.full_duration = options["duration"]
+        self.evaluated_values = list(self.evaluate_tree(options))
+
+    def evaluate_durations(self, duration=None):
+        """Calculate new durations by dividing with the number of items in the sequence"""
+        if duration is None:
+            duration = self.full_duration
+        new_d = duration / len(self.evaluated_values)
+        for item in self.evaluated_values:
+            if isinstance(item, Subdivision):
+                yield from item.evaluate_durations(new_d)
+            if isinstance(item, Event):
+                if duration is not None:
+                    item.duration = new_d
+                    item.beat = new_d * 4
+                yield item
+
+
+@dataclass(kw_only=True)
+class ListOperation(Sequence):
+    """Class for list operations"""
+
+    evaluated_values: list = None
+
+    def evaluate(self, options=DEFAULT_OPTIONS.copy()):
+        """Evaluates the operation"""
+
+        def _filter_whitespace(input_list):
+            for item in input_list:
+                if isinstance(item, Meta):
+                    yield item
+
+        def _filter_operation(input_list, options):
+            """Filter and evaluate values"""
+            flattened_list = []
+            for item in input_list:
+                if isinstance(item, (list, Sequence)):
+                    if isinstance(item, ListOperation):
+                        flattened_list.extend(item.evaluated_values)
+                    elif isinstance(item, Subdivision):
+                        item.evaluate_values(options)
+                        flattened_list.extend(list(item.evaluate_durations()))
+                    elif isinstance(item, RepeatedListSequence):
+                        flattened_list.extend(list(item.resolve_repeat(options)))
+                    elif isinstance(item, Eval):
+                        flattened_list.extend(item.evaluate_values(options))
+                    else:
+                        flattened_list.append(_filter_operation(item, options))
+                elif isinstance(item, Cyclic):
+                    value = item.get_value(options)
+                    if isinstance(value, Sequence):
+                        flattened_list.extend(_filter_operation(value, options))
+                    elif isinstance(value, (Event, RandomInteger, Integer)):
+                        flattened_list.append(value)
+                elif isinstance(item, Modification):
+                    options = options | item.as_options()
+                elif isinstance(item, RomanNumeral):
+                    item = item.evaluate_chord(options)
+                    flattened_list.append(item)
+                elif isinstance(item, Range):
+                    flattened_list.extend(list(item.evaluate(options)))
+                elif isinstance(item, (Event, RandomInteger, Integer)):
+                    item.update_options(options)
+                    item = update_item(item, options)
+                    flattened_list.append(item)
+
+            if isinstance(input_list, Sequence):
+                return replace(input_list, values=flattened_list)
+
+            return flattened_list
+
+        def _pick_from_list(left, right, options):
+            """Pick random numbers from a list"""
+            if isinstance(left, Sequence):
+                left = _filter_operation(left, options)
+            
+            if isinstance(right, Sequence):
+                right = _filter_operation(right, options)
+            
+            if not isinstance(right, (list, Sequence)):
+                right = Sequence(values=[right])
+            
+            result = []
+
+            for num in right.values:
+                for _ in range(num.get_value(options)):
+                    result.append(random.choice(left.values))
+            return flatten(result)
+        
+
+        def _select_from_list(left, right, options):
+            """Select number of items from shuffled list"""
+            if isinstance(left, Sequence):
+                left = _filter_operation(left, options)
+            
+            if isinstance(right, Sequence):
+                right = _filter_operation(right, options)
+            
+            if not isinstance(right, (list, Sequence)):
+                right = Sequence(values=[right])
+            
+            result = []
+            left = left.values
+
+            for num in right.values:
+                random.shuffle(left)
+                num = num.get_value(options)
+                new_list = [left[i % len(left)] for i in range(num)]
+                result += new_list
+                
+            return flatten(result)
+
+        def _vertical_arpeggio(left, right, options):
+            """Vertical arpeggio operation, eg. (135)@(q 1 2 021)"""
+            left = _filter_operation(left, options)
+            right = _filter_operation(right, options)
+            if not isinstance(left, list):
+                left = list(left.evaluate_tree(options))
+            if not isinstance(right, list):
+                right = list(right.evaluate_tree(options))
+            arp_items = []
+
+            for item in left:
+                for index in right:
+                    pcs = item.pitch_classes
+                    if isinstance(index, Pitch):
+                        new_pitch = deepcopy(pcs[index.get_value(options) % len(pcs)])
+                        new_pitch.duration = index.duration
+                        arp_items.append(new_pitch)
+                    else:  # Should be a chord
+                        new_pitches = []
+                        for pitch in index.pitch_classes:
+                            new_pitch = deepcopy(
+                                pcs[pitch.get_value(options) % len(pcs)]
+                            )
+                            new_pitch.duration = pitch.duration
+                            new_pitches.append(new_pitch)
+                        new_chord = Chord(pitch_classes=new_pitches, kwargs=options)
+                        new_chord.update_notes()
+                        new_chord.text = "".join(
+                            [val.text for val in new_chord.pitch_classes]
+                        )
+                        arp_items.append(new_chord)
+
+            return Sequence(values=arp_items)
+
+        def _horizontal_arpeggio(left, right, options):
+            """Horizontal arpeggio operation, eg. (1 2 3 4)#(0 3 2 1)"""
+            left = _filter_operation(left, options)
+            right = _filter_operation(right, options)
+            left = list(left.evaluate_tree(options))
+            right = list(right.evaluate_tree(options))
+            arp_items = []
+            for index in right:
+                new_item = deepcopy(left[index.get_value(options) % len(left)])
+                arp_items.append(new_item)
+            return Sequence(values=arp_items)
+
+        def _cyclic_zip(left, right, options):
+            """Cyclic zip operaiton, eg. (q e)<>(1 2 3)"""
+            left = list(_filter_whitespace(left))
+            right = list(_filter_whitespace(right))
+            result = Sequence(values=cyclic_zip(left, right))
+            return _filter_operation(result, options)
+
+        def _python_operations(left, right, options):
+            """Python math operations"""
+
+            def __chord_operation(chord, pitch_y, yass, options):
+                """Operation for single chords"""
+                new_pitches = []
+                pitch_y = pitch_y.get_value(options)
+                for pitch_x in chord.pitch_classes:
+                    pitch_x = pitch_x.pitch_class
+                    pitch_y = resolve_integer_value(pitch_y, options)
+                    new_pitch = Pitch(
+                        pitch_class=operation(
+                            pitch_y if yass else pitch_x, pitch_x if yass else pitch_y
+                        ),
+                        kwargs=options,
+                    )
+                    new_pitches.append(new_pitch)
+                new_chord = Chord(pitch_classes=new_pitches, kwargs=options)
+                new_chord.update_notes()
+                return new_chord
+
+            # _python_operation starts. Filter & evaluate items.
+
+            left = _filter_operation(left, options)
+            if isinstance(right, Sequence):
+                right = _filter_operation(right, options)
+            elif isinstance(right, Cyclic):
+                right = right.get_value(options)
+
+            # Create product of items.
+            pairs = product(
+                (right.values if isinstance(right, Sequence) else [right]), left
+            )
+
+            results = []
+            for first, second in pairs:
+                if isinstance(first, Chord) and isinstance(second, Chord):
+                    new_pitches = []
+                    for pitch_x in first.pitch_classes:
+                        for pitch_y in second.pitch_classes:
+                            new_pitch = Pitch(
+                                pitch_class=operation(
+                                    pitch_x.pitch_class, pitch_y.pitch_class
+                                ),
+                                kwargs=options,
+                            )
+                            new_pitches.append(new_pitch)
+                        new_chord = Chord(pitch_classes=new_pitches, kwargs=options)
+                        new_chord.update_notes()
+                        outcome = new_chord
+                elif isinstance(first, Chord):
+                    outcome = __chord_operation(first, second, False, options)
+                elif isinstance(second, Chord):
+                    outcome = __chord_operation(second, first, True, options)
+                elif isinstance(first, Rest) or isinstance(second, Rest):
+                    outcome = Rest(duration=first.get_duration())
+                else:
+                    outcome = Pitch(
+                        pitch_class=operation(
+                            first.get_value(options), second.get_value(options)
+                        ),
+                        kwargs=second.get_options(),
+                    )
+                results.append(outcome)
+            return results
+
+        # Start of the evaluate() function
+
+        operators = self.values[1::2]  # Fetch every second operator element
+        values = self.values[::2]  # Fetch every second list element
+        # values = _filter_operation(values, options)  # Filter out
+        if len(values) == 1:
+            return values[0]  # If right hand doesnt contain anything sensible
+        left = values[0]  # Start results with the first array
+
+        for i, operand in enumerate(operators):
+            operation = operand.value
+            right = values[i + 1]
+            if isinstance(operation, str):
+                if operation == "vertical":
+                    left = _vertical_arpeggio(left, right, options)
+                elif operation == "horizontal":
+                    left = _horizontal_arpeggio(left, right, options)
+                elif operation == "zip":
+                    left = _cyclic_zip(left, right, options)
+                elif operation == "pick":
+                    left = _pick_from_list(left, right, options)
+                elif operation == "select":
+                    left = _select_from_list(left, right, options)
+                
+            else:
+                left = _python_operations(left, right, options)
+        return left
+
+
+@dataclass(kw_only=True)
+class Eval(Sequence):
+    """Class for evaluation notation"""
+
+    wrap_start: str = field(default="{", repr=False)
+    wrap_end: str = field(default="}", repr=False)
+
+    # def __post_init__(self):
+    #    self.text = "".join([val.text for val in flatten(self.values)])
+    #   super().__post_init__()
+
+    def evaluate_values(self, options):
+        operations = [val for val in self.values if isinstance(val, (Operation, Rest))]
+        eval_values = []
+        for val in operations:
+            if isinstance(val,Operation):
+                eval_values.append(Pitch(pitch_class=val.evaluate(), kwargs=options | val.local_options))
+            else:
+                eval_values.append(val)
+
+        self.evaluated_values = eval_values
+
+        return self.evaluated_values
+
+
+@dataclass(kw_only=True)
+class LispOperation(Sequence):
+    """Class for lisp-like operations: (+ 1 2 3) etc."""
+
+    values: list
+    operator: operator
+
+
+@dataclass(kw_only=True)
+class Operation(Sequence):
+    """Class for sequential operations"""
+
+    values: list
+
+    def evaluate(self):
+        return eval(self.text)
+
+
+@dataclass(kw_only=True)
+class RepeatedSequence(Sequence):
+    """Class for repeats"""
+
+    repeats: RandomInteger | Integer = field(default_factory=Integer(value=1, text="1"))
+    wrap_start: str = field(default="[:", repr=False)
+    wrap_end: str = field(default=":]", repr=False)
+
+    evaluated_values: list = None
+
+    def resolve_repeat(self, options):
+        """Resolves all items"""
+        self.evaluate_values(options)
+        repeats = self.repeats.get_value(options)
+        if not isinstance(repeats, int):
+            repeats = resolve_integer_value(repeats, options)
+        for _ in range(repeats):
+            for item in self.evaluated_values:
+                yield from resolve_item(item, options)
+
+    def evaluate_values(self, options):
+        """Evaluate values and store to evaluated_values"""
+        self.evaluated_values = list(self.evaluate(options))
+
+    def evaluate(self, options: dict):
+        """Evaluate repeated sequence partially. Leaves Cycles intact."""
+        self.local_options = options.copy()
+        for item in self.values:
+            if isinstance(item, Sequence):
+                if isinstance(item, ListOperation):
+                    yield from item.evaluate_tree(self.local_options, True)
+                elif isinstance(item, RepeatedSequence):
+                    yield item
+                elif isinstance(item, Subdivision):
+                    item.evaluate_values(options)
+                    yield item
+                elif isinstance(item, Eval):
+                    yield from item.evaluate_values(options)
+                else:
+                    yield from item
+            elif isinstance(item, Cyclic):
+                yield item  # Return the cycle instead of values
+            elif isinstance(item, Modification):
+                self.local_options = self.local_options | item.as_options()
+            elif isinstance(item, Rest):
+                yield item.get_updated_item(self.local_options)
+            elif isinstance(item, Range):
+                yield from item.evaluate(self.local_options)
+            elif isinstance(item, (Pitch, Chord, RomanNumeral)):
+                yield item
+            elif isinstance(item, (Event, RandomInteger)):
+                yield Pitch(
+                    pitch_class=item.get_value(self.local_options),
+                    kwargs=self.local_options,
+                )
+
+
+@dataclass(kw_only=True)
+class Euclid(Item):
+    """Class for euclidean cycles"""
+
+    pulses: int
+    length: int
+    onset: ListSequence
+    offset: ListSequence = field(default=None)
+    rotate: int = field(default=0)
+    evaluated_values: list = field(default=None)
+
+    def evaluate(self, options):
+        """Evaluate values using euclidean spread"""
+        onset_values = [
+            val for val in self.onset.values if not isinstance(val, Whitespace)
+        ]
+        onset_length = len(onset_values)
+        booleans = euclidian_rhythm(self.pulses, self.length, self.rotate)
+        self.evaluated_values = []
+
+        if self.offset is not None:
+            offset_values = [
+                val for val in self.offset.values if not isinstance(val, Whitespace)
+            ]
+            offset_length = len(offset_values)
+
+        on_i = 0
+        off_i = 0
+
+        for i in range(self.length):
+            if booleans[i]:
+                value = onset_values[on_i % onset_length]
+                on_i += 1
+            else:
+                if self.offset is None:
+                    value = Rest(duration=options["duration"])
+                else:
+                    value = offset_values[off_i % offset_length]
+                off_i += 1
+
+            self.evaluated_values.append(value)
--- a/ziffers/common.py
+++ b/ziffers/common.py
@ -1,12 +1,39 @@
 """ Common methods used in parsing """
+import re
+from copy import deepcopy
+
+
 def flatten(arr: list) -> list:
    """Flattens array"""
    return (
        flatten(arr[0]) + (flatten(arr[1:]) if len(arr) > 1 else [])
-        if isinstance(arr, list) else [arr]
+        if isinstance(arr, list)
+        else [arr]
    )


+def rotate(arr, k):
+    """Rotates array"""
+    # Calculate the effective rotation amount (mod the array length)
+    k = k % len(arr)
+    # Rotate the array to the right
+    if k > 0:
+        arr = arr[-k:] + arr[:-k]
+    # Rotate the array to the left
+    elif k < 0:
+        arr = arr[-k:] + arr[:-k]
+    return arr
+
+
+def repeat_text(pos, neg, times):
+    """Helper to repeat text"""
+    if times > 0:
+        return pos * times
+    if times < 0:
+        return neg * abs(times)
+    return ""
+
+
 def sum_dict(arr: list[dict]) -> dict:
    """Sums a list of dicts: [{a:3,b:3},{b:1}] -> {a:3,b:4}"""
    result = arr[0]
@ -17,3 +44,73 @@ def sum_dict(arr: list[dict]) -> dict:
            else:
                result[key] = element[key]
    return result
+
+
+def string_rewrite(axiom: str, rules: dict):
+    """String rewrite / Lindemeyer system for rule based text manipulation
+
+    Args:
+        axiom (str): Input string
+        rules (dict): String manipulation rules in dict:
+
+    Example:
+        rules = {
+            "1": "2",
+            "[2-9]": "45",
+            "4": lambda: str(randint(1, 7)),
+            "([1-9])(5)": lambda a, b: str(int(a)*int(b))
+        }
+
+        for i range(10):
+            print(string_rewrite("1", rules))
+    """
+
+    def _apply_rules(match):
+        for key, value in rules.items():
+            if re.match(key, match.group(0)):
+                if callable(value):
+                    yield value(
+                        *match.groups()
+                    ) if value.__code__.co_argcount > 0 else value()
+                yield value
+
+    pattern = re.compile("|".join(rules.keys()))
+    return pattern.sub(lambda m: next(_apply_rules(m)), axiom)
+
+
+def euclidian_rhythm(pulses: int, length: int, rot: int = 0):
+    """Calculate Euclidean rhythms. Original algorithm by Thomas Morrill."""
+
+    def _starts_descent(arr, index):
+        length = len(arr)
+        next_index = (index + 1) % length
+        return arr[index] > arr[next_index]
+
+    def rotation(arr, idx):
+        return arr[-idx:] + arr[:-idx]
+
+    if pulses >= length:
+        return [True]
+
+    res_list = [pulses * t % length for t in range(-1, length - 1)]
+    bool_list = [_starts_descent(res_list, index) for index in range(length)]
+
+    return rotation(bool_list, rot)
+
+
+def cyclic_zip(first: list, second: list) -> list:
+    """Cyclic zip method
+
+    Args:
+        first (list): First list is cycled
+        second (list): Second list
+
+    Returns:
+        list: Cyclicly zipped list
+    """
+    result = []
+    s_length = len(second)
+    f_length = len(first)
+    for i in range(s_length):
+        result.append([first[i % f_length], second[i]])
+    return [deepcopy(item) for sublist in result for item in sublist]
--- a/ziffers/converters.py
+++ b/ziffers/converters.py
@ -0,0 +1,131 @@
+"""Collection of converters"""
+from ziffers import zparse, Ziffers, Pitch, Rest, Chord, accidentals_from_note_name, MODES, MODE_ACCIDENTALS
+
+try:
+    from music21 import converter, note, stream, meter, chord, environment, tempo, key
+    music21_imported: bool = True
+except ImportError:
+    music21_imported: bool = False
+
+try:
+    import ctcsound
+    csound_imported: bool = True
+except (ImportError, TypeError) as Error:
+    csound_imported: bool = False
+
+def ziffers_to_csound_score(ziffers: Ziffers, bpm: int=80, amp: float=1500, instr: (int|str)=1) -> str:
+    """ Transform Ziffers object to Csound score in format:
+        i {instrument} {start time} {duration} {amplitude} {frequency} """
+    
+    if not csound_imported:
+        raise ImportError("Install Csound")
+
+    score = ""
+    instr = f'"{instr}"' if isinstance(instr, str) else instr
+    start_time = 0
+    for item in ziffers.evaluated_values:
+        if isinstance(item, Chord):
+            for freq, dur in zip(item.get_freq(), item.get_duration()):
+                score += f"i {instr} {start_time} {dur * 4 * 60 / bpm} {amp} {freq:.2f}\n"
+            start_time += max(item.get_duration()) * 4 * 60 / bpm
+        elif isinstance(item, Rest):
+            score += f"i {instr} {start_time} {item.get_duration() * 4 * 60 / bpm} {amp} 0\n"
+        elif isinstance(item, Pitch):
+            score += f"i {instr} {start_time} {item.get_duration() * 4 * 60 / bpm} {amp} {item.get_freq():.2f}\n"
+            start_time += item.get_duration() * 4 * 60 / bpm
+    return score
+
+def to_music21(expression: str | Ziffers, **options):
+    """Helper for passing options to the parser"""
+
+    if not music21_imported:
+        raise ImportError("Install Music21 library")
+
+    # Register the ZiffersMusic21 converter
+    converter.registerSubConverter(ZiffersMusic21)
+
+    if isinstance(expression, Ziffers):
+        if options:
+            options["preparsed"] = expression
+        else:
+            options = {"preparsed": expression}
+        options = {"ziffers": options}
+        return converter.parse("PREPARSED", format="ziffers", keywords=options)
+
+    if options:
+        options = {"ziffers": options}
+        return converter.parse(expression, format="ziffers", keywords=options)
+
+    test = converter.parse(expression, format="ziffers")
+    return test
+
+
+def set_musescore_path(path: str):
+    """Helper for setting the Musescore path"""
+    settings = environment.UserSettings()
+    # Default windows path:
+    # 'C:\\Program Files\\MuseScore 3\\bin\\MuseScore3.exe'
+    settings["musicxmlPath"] = path
+    settings["musescoreDirectPNGPath"] = path
+
+
+if music21_imported:
+
+    # pylint: disable=locally-disabled, invalid-name, unused-argument, attribute-defined-outside-init
+    class ZiffersMusic21(converter.subConverters.SubConverter):
+        """Ziffers converter to Music21"""
+
+        registerFormats = ("ziffers",)
+        registerInputExtensions = ("zf",)
+
+        def parseData(self, dataString, number=None):
+            """Parses Ziffers string to Music21 object"""
+            # Look for options in keywords object
+            keywords = self.keywords["keywords"]
+            if "ziffers" in keywords:
+                options = keywords["ziffers"]
+                if "preparsed" in options:
+                    parsed = options["preparsed"]
+                else:
+                    parsed = zparse(dataString, **options)
+            else:
+                parsed = zparse(dataString)
+
+            note_stream = stream.Part()
+
+            if "time" in options:
+                m_item = meter.TimeSignature(options["time"])  # Common time
+            else:
+                m_item = meter.TimeSignature("c")  # Common time
+
+            note_stream.insert(0, m_item)
+
+            if "key" in options:
+                accidentals = accidentals_from_note_name(options["key"])
+            else:
+                accidentals = 0
+
+            if "scale" in options:
+                scale_upper = options["scale"].upper()
+                scale_lower = options["scale"].lower()
+                if scale_upper in MODES:
+                    accidentals += MODE_ACCIDENTALS[scale_upper]
+                    note_stream.append(key.KeySignature(accidentals,mode=scale_lower))
+            else:
+                note_stream.append(key.KeySignature(accidentals))
+
+            if "bpm" in options:
+                note_stream.append(tempo.MetronomeMark(number=options["bpm"]))
+            
+            for item in parsed:
+                if isinstance(item, Pitch):
+                    m_item = note.Note(item.note)
+                    m_item.duration.quarterLength = item.duration * 4
+                elif isinstance(item, Rest):
+                    m_item = note.Rest(item.duration * 4)
+                elif isinstance(item, Chord):
+                    m_item = chord.Chord(item.notes)
+                    m_item.duration.quarterLength = item.duration * 4
+                note_stream.append(m_item)
+            # TODO: Is this ok?
+            self.stream = note_stream.makeMeasures()
--- a/ziffers/defaults.py
+++ b/ziffers/defaults.py
--- a/ziffers/generators.py
+++ b/ziffers/generators.py
@ -0,0 +1,35 @@
+"""Collection of generators"""
+
+
+# Sieve of Eratosthenes
+# Based on code by David Eppstein, UC Irvine, 28 Feb 2002
+# http://code.activestate.com/recipes/117119/
+def gen_primes():
+    """Generate an infinite sequence of prime numbers."""
+    # Maps composites to primes witnessing their compositeness.
+    # This is memory efficient, as the sieve is not "run forward"
+    # indefinitely, but only as long as required by the current
+    # number being tested.
+    sieve = {}
+
+    # The running integer that's checked for primeness
+    current = 2
+
+    while True:
+        if current not in sieve:
+            # current is a new prime.
+            # Yield it and mark its first multiple that isn't
+            # already marked in previous iterations
+            yield current
+            sieve[current * current] = [current]
+        else:
+            # current is composite. sieve[current] is the list of primes that
+            # divide it. Since we've reached current, we no longer
+            # need it in the map, but we'll mark the next
+            # multiples of its witnesses to prepare for larger
+            # numbers
+            for composite in sieve[current]:
+                sieve.setdefault(composite + current, []).append(composite)
+            del sieve[current]
+
+        current += 1
--- a/ziffers/mapper.py
+++ b/ziffers/mapper.py
@ -1,85 +1,147 @@
 """ Lark transformer for mapping Lark tokens to Ziffers objects """
-from typing import Optional
-from lark import Transformer
-from .classes import (
-    Ziffers,
+import random
+from lark import Transformer, Token
+from .scale import cents_to_semitones, ratio_to_cents, monzo_to_cents
+from .classes.root import Ziffers
+from .classes.sequences import (
+    Sequence,
+    ListSequence,
+    RepeatedListSequence,
+    ListOperation,
+    RepeatedSequence,
+    Euclid,
+    Subdivision,
+    Eval,
+    Operation,
+    LispOperation,
+)
+from .classes.items import (
    Whitespace,
    DurationChange,
    OctaveChange,
    OctaveAdd,
    Pitch,
+    Rest,
    RandomPitch,
    RandomPercent,
    Chord,
    RomanNumeral,
-    Sequence,
-    ListSequence,
-    RepeatedListSequence,
-    Subdivision,
    Cyclic,
    RandomInteger,
    Range,
    Operator,
-    ListOperation,
-    Operation,
-    Eval,
    Atom,
    Integer,
-    Euclid,
-    RepeatedSequence,
+    VariableAssignment,
+    Variable,
+    VariableList,
+    Measure,
 )
 from .common import flatten, sum_dict
 from .defaults import DEFAULT_DURS, OPERATORS
-from .scale import parse_roman, chord_from_roman_numeral
+from .scale import parse_roman


 # pylint: disable=locally-disabled, unused-argument, too-many-public-methods, invalid-name
 class ZiffersTransformer(Transformer):
    """Rules for transforming Ziffers expressions into tree."""

-    def __init__(self, options: Optional[dict] = None):
-        super().__init__()
-        self.options = options
-
    def start(self, items) -> Ziffers:
        """Root for the rules"""
-       # seq = Sequence(values=items[0])
        return Ziffers(values=items[0], options={})

    def sequence(self, items):
        """Flatten sequence"""
        return flatten(items)

-    def random_integer(self, item) -> RandomInteger:
-        """Parses random integer syntax"""
-        val = item[0][1:-1].split(",")
-        return RandomInteger(min=int(val[0]), max=int(val[1]), text=item[0].value)
+    def rest(self, items):
+        """Return duration event"""
+        if len(items) > 0:
+            prefixes = sum_dict(items)
+            text_prefix = prefixes.pop("text")
+            prefixes["prefix"] = text_prefix
+            return Rest(text=text_prefix + "r", local_options=prefixes)
+        return Rest(text="r")

-    def range(self, item) -> Range:
+    def measure(self, items):
+        """Return new measure"""
+        return Measure()
+
+    def random_integer(self, items) -> RandomInteger:
+        """Parses random integer syntax"""
+        if len(items) > 1:
+            prefixes = sum_dict(items[0:-1])  # If there are prefixes
+            text_prefix = prefixes.pop("text")
+            prefixes["prefix"] = text_prefix
+            val = items[-1][1:-1].split(",")
+            return RandomInteger(
+                min=int(val[0]),
+                max=int(val[1]),
+                text=text_prefix + items[-1],
+                local_options=prefixes,
+            )
+        else:
+            val = items[0][1:-1].split(",")
+            return RandomInteger(min=int(val[0]), max=int(val[1]), text=items[0])
+
+    def random_integer_re(self, items):
+        """Return random integer notation from regex"""
+        return items[0].value
+
+    def range(self, items) -> Range:
        """Parses range syntax"""
-        val = item[0].split("..")
-        return Range(start=val[0], end=val[1], text=item[0])
+        if len(items) > 1:
+            prefixes = sum_dict(items[0:-1])  # If there are prefixes
+            text_prefix = prefixes.pop("text")
+            prefixes["prefix"] = text_prefix
+            val = items[-1].split("..")
+            return Range(
+                start=int(val[0]),
+                end=int(val[1]),
+                text=text_prefix + items[-1],
+                local_options=prefixes,
+            )
+        # Else
+        val = items[0].split("..")
+        return Range(start=int(val[0]), end=int(val[1]), text=items[0])
+
+    def range_re(self, items):
+        """Return range value from regex"""
+        return items[0].value

    def cycle(self, items) -> Cyclic:
        """Parses cycle"""
        values = items[0]
        return Cyclic(values=values)

-    def pitch_class(self, item):
+    def pitch_class(self, items):
        """Parses pitch class"""

        # If there are prefixes
-        if len(item) > 1:
+        if len(items) > 1:
            # Collect&sum prefixes from any order: _qee^s4 etc.
-            result = sum_dict(item)
-            return Pitch(**result)
+            prefixes = sum_dict(items[0:-1])  # If there are prefixes
+            text_prefix = prefixes.pop("text")
+            prefixes["prefix"] = text_prefix
+            pitch = Pitch(
+                pitch_class=items[-1]["pitch_class"],
+                text=text_prefix + items[-1]["text"],
+                local_options=prefixes,
+            )
+            return pitch

-        val = item[0]
+        val = items[0]
        return Pitch(**val)

    def pitch(self, items):
        """Return pitch class info"""
-        return {"pitch_class": int(items[0].value), "text": items[0].value}
+        text_value = items[0].value.replace("T", "10").replace("E", "11")
+        return {"pitch_class": int(text_value), "text": items[0].value}
+
+    def escaped_pitch(self, items):
+        """Return escaped pitch"""
+        val = items[0].value[1:-1]
+        return {"pitch_class": int(val), "text": val}

    def prefix(self, items):
        """Return prefix"""
@ -88,7 +150,10 @@ class ZiffersTransformer(Transformer):
    def oct_change(self, items):
        """Parses octave change"""
        octave = items[0]
-        return [OctaveChange(value=octave["octave"], text=octave["text"]), items[1]]
+        return [
+            OctaveChange(value=octave["octave_change"], text=octave["text"]),
+            items[1],
+        ]

    def oct_mod(self, items):
        """Parses octave modification"""
@ -98,7 +163,7 @@ class ZiffersTransformer(Transformer):
    def escaped_octave(self, items):
        """Return octave info"""
        value = items[0][1:-1]
-        return {"octave": int(value), "text": items[0].value}
+        return {"octave_change": int(value), "text": items[0].value}

    def octave(self, items):
        """Return octaves ^ and _"""
@ -108,26 +173,48 @@ class ZiffersTransformer(Transformer):
    def modifier(self, items):
        """Return modifiers # and b"""
        value = 1 if items[0].value == "#" else -1
-        return {"modifier": value}
+        return {"modifier": value, "text": items[0].value}

    def chord(self, items):
        """Parses chord"""
+        if isinstance(items[-1], Token):
+            return Chord(
+                pitch_classes=items[0:-1],
+                text="".join([val.text for val in items[0:-1]]),
+                inversions=int(items[-1].value[1:]),
+            )
        return Chord(pitch_classes=items, text="".join([val.text for val in items]))

+    def invert(self, items):
+        """Return chord inversion"""
+        return items[0]
+
    def named_roman(self, items) -> RomanNumeral:
        """Parse chord from roman numeral"""
        numeral = items[0].value
-        if len(items) > 1:
+        # TODO: Refactor this and the rule
+        if len(items) == 1:
+            return RomanNumeral(value=parse_roman(numeral), text=numeral)
+        if len(items) > 2:
            name = items[1]
-            chord_notes = chord_from_roman_numeral(numeral, name)
-            parsed_number = parse_roman(numeral)
+            inversions = int(items[-1].value[1:])
            return RomanNumeral(
-                text=numeral, value=parsed_number, chord_type=name, notes=chord_notes
+                text=numeral,
+                value=parse_roman(numeral),
+                chord_type=name,
+                inversions=inversions,
            )
+        elif len(items) == 2:
+            if isinstance(items[-1], Token):
+                inversions = int(items[-1].value[1:])
                return RomanNumeral(
                    value=parse_roman(numeral),
                    text=numeral,
-            notes=chord_from_roman_numeral(numeral),
+                    inversions=inversions,
+                )
+            else:
+                return RomanNumeral(
+                    value=parse_roman(numeral), text=numeral, chord_type=items[1]
                )

    def chord_name(self, item):
@ -136,7 +223,7 @@ class ZiffersTransformer(Transformer):

    def roman_number(self, item):
        """Return roman numeral"""
-        return item.value
+        return item[0]

    def dur_change(self, items):
        """Parses duration change"""
@ -213,9 +300,7 @@ class ZiffersTransformer(Transformer):
    def subdivision(self, items):
        """Parse subdivision"""
        values = flatten(items[0])
-        return Subdivision(
-            values=values, text="[" + "".join([val.text for val in values]) + "]"
-        )
+        return Subdivision(values=values, wrap_start="[", wrap_end="]")

    def subitems(self, items):
        """Return subdivision items"""
@ -225,8 +310,7 @@ class ZiffersTransformer(Transformer):

    def eval(self, items):
        """Parse eval"""
-        val = items[0]
-        return Eval(values=val)
+        return Eval(values=items)

    def sub_operations(self, items):
        """Returns list of operations"""
@ -234,12 +318,52 @@ class ZiffersTransformer(Transformer):

    def operation(self, items):
        """Return partial eval operations"""
-        return flatten(items)
+        if isinstance(items[0], dict):
+            local_opts = items[0]
+            del local_opts["text"]
+            return Operation(values=flatten(items[1:]), local_options=items[0])
+        return Operation(values=flatten(items))

    def atom(self, token):
        """Return partial eval item"""
        val = token[0].value
-        return Atom(value=val, text=val)
+        return Atom(value=val, text=str(val))
+
+    # Variable assignment
+
+    def assignment(self, items):
+        """Creates variable assignment"""
+        var = items[0]
+        op = items[1]
+        content = items[2]
+        return VariableAssignment(
+            variable=var,
+            value=content,
+            text=var.text + "=" + content.text,
+            pre_eval=True if op == "=" else False,
+        )
+
+    def ass_op(self, items):
+        """Return parsed type for assignment: = or ~"""
+        return items[0].value
+
+    def variable(self, items):
+        """Return variable"""
+        if len(items) > 1:
+            prefixes = sum_dict(items[0:-1])
+            text_prefix = prefixes.pop("text")
+            return Variable(
+                name=items[-1], text=text_prefix + items[-1], local_options=prefixes
+            )
+        return Variable(name=items[0], text=items[0])
+
+    def variable_char(self, items):
+        """Return parsed variable name"""
+        return items[0].value  # Variable(name=items[0].value, text=items[0].value)
+
+    def variablelist(self, items):
+        """Return list of variables"""
+        return VariableList(values=items, text="".join([item.text for item in items]))

    # List rules

@ -247,9 +371,14 @@ class ZiffersTransformer(Transformer):
        """Parse list sequence notation, ex: (1 2 3)"""
        if len(items) > 1:
            prefixes = sum_dict(items[0:-1])
+            text_prefix = prefixes.pop("text")
+            prefixes["prefix"] = text_prefix
            values = items[-1]
-            seq = ListSequence(values=values, wrap_start=prefixes["text"] + "(")
-            seq.update_values(prefixes)
+            seq = ListSequence(
+                values=values,
+                wrap_start=prefixes["prefix"] + "(",
+                local_options=prefixes,
+            )
            return seq
        else:
            seq = ListSequence(values=items[0])
@ -264,12 +393,13 @@ class ZiffersTransformer(Transformer):
                    values=items[-2],
                    repeats=items[-1],
                    wrap_end=":" + items[-1].text + ")",
+                    local_options=prefixes,
                )
            else:
                seq = RepeatedListSequence(
-                    values=items[-2], repeats=Integer(text="1", value=1)
+                    values=items[-2],
+                    repeats=Integer(text="2", value=2, local_options=prefixes),
                )
-            seq.update_values(prefixes)
            return seq
        else:
            if items[-1] is not None:
@ -280,13 +410,14 @@ class ZiffersTransformer(Transformer):
                )
            else:
                seq = RepeatedListSequence(
-                    values=items[-2], repeats=Integer(text="1", value=1)
+                    values=items[-2], repeats=Integer(text="2", value=2)
                )
            return seq

-    def NUMBER(self, token):
-        """Parse integer"""
-        val = token.value
+    def integer(self, items):
+        """Parses integer from single ints"""
+        concatted = sum_dict(items)
+        val = concatted["text"]
        return Integer(text=val, value=int(val))

    def number(self, item):
@ -300,8 +431,8 @@ class ZiffersTransformer(Transformer):
    def lisp_operation(self, items):
        """Parse lisp like list operation"""
        op = items[0]
-        values = items[1:]
-        return Operation(
+        values = items[2]
+        return LispOperation(
            operator=op,
            values=values,
            text="(+" + "".join([v.text for v in values]) + ")",
@ -312,6 +443,11 @@ class ZiffersTransformer(Transformer):
        val = token[0].value
        return Operator(text=val, value=OPERATORS[val])

+    def list_operator(self, token):
+        """Parse list operator"""
+        val = token[0].value
+        return Operator(text=val, value=OPERATORS[val])
+
    def list_items(self, items):
        """Parse sequence"""
        return Sequence(values=items)
@ -320,17 +456,17 @@ class ZiffersTransformer(Transformer):
        """Parse list operation"""
        return ListOperation(values=items)

-    def right_op(self,items):
+    def right_op(self, items):
        """Get right value for the operation"""
        return items[0]

    def euclid(self, items):
        """Parse euclid notation"""
        params = items[1][1:-1].split(",")
-        init = {"onset": items[0], "pulses": params[0], "length": params[1]}
+        init = {"onset": items[0], "pulses": int(params[0]), "length": int(params[1])}
        text = items[0].text + items[1]
        if len(params) > 2:
-            init["rotate"] = params[2]
+            init["rotate"] = int(params[2])
        if len(items) > 2:
            init["offset"] = items[2]
            text = text + items[2].text
@ -348,4 +484,97 @@ class ZiffersTransformer(Transformer):
                values=items[0], repeats=items[-1], wrap_end=":" + items[-1].text + "]"
            )
        else:
-            return RepeatedSequence(values=items[0], repeats=Integer(value=1, text="1"))
+            return RepeatedSequence(values=items[0], repeats=Integer(value=2, text="2"))
+
+    def repeat_item(self, items):
+        """Parse repeat item syntax to sequence, ex: 1:4 (1 2 3):5"""
+        return RepeatedListSequence(
+            values=[items[0]],
+            repeats=items[1],
+            wrap_start="",
+            wrap_end=":" + items[1].text,
+        )
+
+
+# pylint: disable=locally-disabled, unused-argument, too-many-public-methods, invalid-name, eval-used
+class ScalaTransformer(Transformer):
+    """Transformer for scala scales"""
+
+    def lines(self, items):
+        """Transforms cents to semitones"""
+        cents = [
+            ratio_to_cents(item) if isinstance(item, int) else item for item in items
+        ]
+        return cents_to_semitones(cents)
+
+    def operation(self, items):
+        """Get operation"""
+        # Safe eval. Items are pre-parsed.
+        val = eval("".join(str(item) for item in items))
+        return val
+
+    def operator(self, items):
+        """Get operator"""
+        return items[0].value
+
+    def sub_operations(self, items):
+        """Get sub-operation"""
+        return "(" + items[0] + ")"
+
+    def frac_ratio(self, items):
+        """Get ration as fraction"""
+        ratio = items[0] / items[1]
+        return ratio_to_cents(ratio)
+
+    def decimal_ratio(self, items):
+        """Get ratio as decimal"""
+        ratio = float(str(items[0]) + "." + str(items[1]))
+        return ratio_to_cents(ratio)
+
+    def monzo(self, items):
+        """Get monzo ratio"""
+        return monzo_to_cents(items)
+
+    def edo_ratio(self, items):
+        """Get EDO ratio"""
+        ratio = pow(2, items[0] / items[1])
+        return ratio_to_cents(ratio)
+        
+    def edji_ratio(self, items):
+        """Get EDJI ratio"""
+        if len(items) > 3:
+            power = items[2] / items[3]
+        else:
+            power = items[2]
+        ratio = pow(power, items[0] / items[1])
+        return ratio_to_cents(ratio)
+
+    def int(self, items):
+        """Get integer"""
+        return int(items[0].value)
+
+    def float(self, items):
+        """Get float"""
+        return float(items[0].value)
+
+    def random_int(self, items):
+        """Get random integer"""
+
+        def _rand_between(start, end):
+            return random.randint(min(start, end), max(start, end))
+
+        start = items[0]
+        end = items[1]
+        rand_val = _rand_between(start, end)
+        return rand_val
+
+    def random_decimal(self, items):
+        """Get random decimal"""
+
+        def _rand_between(start, end):
+            return random.uniform(min(start, end), max(start, end))
+
+        start = items[0]
+        end = items[1]
+        rand_val = _rand_between(start, end)
+        return rand_val
--- a/ziffers/parser.py
+++ b/ziffers/parser.py
@ -1,21 +1,45 @@
 """ Module for the parser """
 from pathlib import Path
+from functools import lru_cache
 from lark import Lark
-from .classes import Ziffers
-from .mapper import ZiffersTransformer
+from .classes.root import Ziffers
+from .mapper import ZiffersTransformer, ScalaTransformer


 grammar_path = Path(__file__).parent
-grammar = grammar_path / "ziffers.lark"
+grammar_folder = Path.joinpath(grammar_path, "spec")
+ziffers_grammar = Path.joinpath(grammar_folder, "ziffers.lark")
+scala_grammar = Path.joinpath(grammar_folder, "scala.lark")

 ziffers_parser = Lark.open(
-    grammar,
+    str(ziffers_grammar),
    rel_to=__file__,
    start="root",
    parser="lalr",
    transformer=ZiffersTransformer(),
 )

+scala_parser = Lark.open(
+    str(scala_grammar),
+    rel_to=__file__,
+    start="root",
+    parser="lalr",
+    transformer=ScalaTransformer(),
+)
+
+def parse_scala(expr: str):
+    """Parse an expression using the Ziffers parser
+
+    Args:
+        expr (str): Ziffers expression as a string
+
+    Returns:
+        Ziffers: Reutrns Ziffers iterable
+    """
+    # Ignore everything before last comment "!"
+    values = expr.split("!")[-1]
+    return scala_parser.parse(values)
+

 def parse_expression(expr: str) -> Ziffers:
    """Parse an expression using the Ziffers parser
@ -28,7 +52,7 @@ def parse_expression(expr: str) -> Ziffers:
    """
    return ziffers_parser.parse(expr)

-
+@lru_cache
 def zparse(expr: str, **opts) -> Ziffers:
    """Parses ziffers expression with options

@ -39,14 +63,32 @@ def zparse(expr: str, **opts) -> Ziffers:
    Returns:
        Ziffers: Returns Ziffers iterable parsed with the given options
    """
+    if "scale" in opts:
+        scale = opts["scale"]
+        if isinstance(scale,str) and not scale.isalpha():
+            parsed_scale = parse_scala(scale)
+            opts["scale"] = parsed_scale
+
    parsed = parse_expression(expr)
    parsed.init_opts(opts)
    return parsed

-
 # pylint: disable=invalid-name


 def z(expr: str, **opts) -> Ziffers:
    """Shortened method name for zparse"""
    return zparse(expr, **opts)
+
+def yield_items(gen: Ziffers, num: int, key: str = None) -> list:
+    """Yield n items from parsed Ziffers"""
+    for i in range(num):
+        if key is not None:
+            yield getattr(gen[i],key,None)
+        else:
+            yield gen[i]
+
+def get_items(gen: Ziffers, num: int, key: str = None) -> list:
+    """Get n-item from parsed Ziffers. Functional alternative to Ziffers-object collect method."""
+    return list(yield_items(gen,num,key))
+    
--- a/ziffers/scale.py
+++ b/ziffers/scale.py
@ -2,9 +2,11 @@
 #!/usr/bin/env python3
 # pylint: disable=locally-disabled, no-name-in-module
 import re
-from math import floor
+from math import log2
+from itertools import islice
+from .generators import gen_primes
+from .common import repeat_text
 from .defaults import (
-    DEFAULT_OCTAVE,
    SCALES,
    MODIFIERS,
    NOTES_TO_INTERVALS,
@ -45,6 +47,12 @@ def note_name_to_interval(name: str) -> int:
    return interval + modifier


+def midi_to_freq(note: int) -> float:
+    """Transform midi to frequency"""
+    freq = 440  # Frequency of A
+    return (freq / 32) * (2 ** ((note - 9) / 12))
+
+
 def note_name_to_midi(name: str) -> int:
    """Parse note name to midi

@ -64,7 +72,7 @@ def note_name_to_midi(name: str) -> int:
    return 12 + octave * 12 + interval + modifier


-def get_scale(name: str) -> list[int]:
+def get_scale(scale: str) -> list[int]:
    """Get a scale from the global scale list

    Args:
@ -73,18 +81,83 @@ def get_scale(name: str) -> list[int]:
    Returns:
        list: List of intervals in the scale
    """
-    scale = SCALES.get(name.lower().capitalize(), SCALES["Chromatic"])
-    return list(map(int, str(scale)))
+    if isinstance(scale, (list, tuple)):
+        return scale
+
+    scale = SCALES.get(scale.lower().capitalize(), SCALES["Ionian"])
+    return scale
+
+
+def get_scale_notes(name: str, root: int = 60, num_octaves: int = 1) -> list[int]:
+    """Return notes for the scale
+
+    Args:
+        name (str): Name of the scale
+        root (int, optional): Root note. Defaults to 60.
+        num_octaves (int, optional): Number of octaves. Defaults to 1.
+
+    Returns:
+        list[int]: List of notes
+    """
+    scale = get_scale(name)
+    scale_notes = [root]
+    for _ in range(num_octaves):
+        scale_notes = scale_notes + [root := root + semitone for semitone in scale]
+    return scale_notes
+
+
+def get_chord_from_scale(
+    degree: int,
+    root: int = 60,
+    scale: str | tuple = "Major",
+    num_notes: int = 3,
+    skip: int = 2,
+) -> list[int]:
+    """Generate chord from the scale by skipping notes
+
+    Args:
+        degree (int): Degree of scale to start on
+        root (int, optional): Root for the scale. Defaults to 60.
+        scale (str, optional): Name of the scale. Defaults to "Major".
+        num_notes (int, optional): Number of notes. Defaults to 3.
+        skip (int, optional): Takes every n from the scale. Defaults to 2.
+
+    Returns:
+        list[int]: List of midi notes
+    """
+    if isinstance(scale, str):
+        scale_length = get_scale_length(scale)
+    else:
+        scale_length = len(scale)
+
+    num_of_octaves = ((num_notes * skip + degree) // scale_length) + 1
+    scale_notes = get_scale_notes(scale, root, num_of_octaves)
+    return scale_notes[degree - 1 :: skip][:num_notes]
+
+
+def get_scale_length(scale: str) -> int:
+    """Get length of the scale
+
+    Args:
+        name (str): Name of the scale
+
+    Returns:
+        int: Length of the scale
+    """
+    if isinstance(scale, (list, tuple)):
+        return len(scale)
+
+    return len(SCALES.get(scale.lower().capitalize(), SCALES["Ionian"]))


 # pylint: disable=locally-disabled, too-many-arguments
 def note_from_pc(
    root: int | str,
    pitch_class: int,
-    intervals: str | list[int | float],
-    cents: bool = False,
+    intervals: str | tuple[int | float],
    octave: int = 0,
    modifier: int = 0,
+    degrees: bool = False
 ) -> int:
    """Resolve a pitch class into a note from a scale

@ -101,14 +174,14 @@ def note_from_pc(
    """

    # Initialization
+    pitch_class = pitch_class-1 if degrees and pitch_class>0 else pitch_class
    root = note_name_to_midi(root) if isinstance(root, str) else root
    intervals = get_scale(intervals) if isinstance(intervals, str) else intervals
-    intervals = list(map(lambda x: x / 100), intervals) if cents else intervals
    scale_length = len(intervals)

    # Resolve pitch classes to the scale and calculate octave
    if pitch_class >= scale_length or pitch_class < 0:
-        octave += floor(pitch_class / scale_length)
+        octave += pitch_class // scale_length
        pitch_class = (
            scale_length - (abs(pitch_class) % scale_length)
            if pitch_class < 0
@ -120,7 +193,12 @@ def note_from_pc(
    # Computing the result
    note = root + sum(intervals[0:pitch_class])

-    return note + (octave * sum(intervals)) + modifier
+    note = note + (octave * sum(intervals)) + modifier
+
+    if isinstance(note, float):
+        return resolve_pitch_bend(note)
+
+    return (note, None)


 def parse_roman(numeral: str) -> int:
@ -154,7 +232,10 @@ def accidentals_from_note_name(name: str) -> int:
    Returns:
        int: Integer representing number of flats or sharps: -7 flat to 7 sharp.
    """
-    idx = CIRCLE_OF_FIFTHS.index(name.upper())
+    if name not in CIRCLE_OF_FIFTHS:
+        name = midi_to_note_name(note_name_to_midi(name))
+
+    idx = CIRCLE_OF_FIFTHS.index(name)
    return idx - 6


@ -182,7 +263,7 @@ def midi_to_tpc(note: int, key: str | int):
        _type_: Tonal Pitch Class value for the note
    """
    if isinstance(key, str):
-        acc = accidentals_from_note_name(key)
+        acc = accidentals_from_note_name(key[0])
    else:
        acc = accidentals_from_midi_note(key)
    return (note * 7 + 26 - (11 + acc)) % 12 + (11 + acc)
@ -197,7 +278,7 @@ def midi_to_octave(note: int) -> int:
    Returns:
        int: Returns default octave in Ziffers where C4 is in octave 0
    """
-    return 0 if note <= 0 else floor(note / 12)
+    return 0 if note <= 0 else note // 12


 def midi_to_pitch_class(note: int, key: str | int, scale: str) -> dict:
@ -211,10 +292,10 @@ def midi_to_pitch_class(note: int, key: str | int, scale: str) -> dict:
    Returns:
        tuple: Returns dict containing pitch-class values
    """
-    pitch_class = note % 12
+    pitch_class = int(note % 12)  # Cast to int "fixes" microtonal scales
    octave = midi_to_octave(note) - 5
-    if scale.upper() == "CHROMATIC":
-        return (str(pitch_class), pitch_class, octave)
+    if isinstance(scale, str) and scale.upper() == "CHROMATIC":
+        return {"text": str(pitch_class), "pitch_class": pitch_class, "octave": octave}

    sharps = ["0", "#0", "1", "#1", "2", "3", "#3", "4", "#4", "5", "#5", "6"]
    flats = ["0", "b1", "1", "b2", "2", "3", "b4", "4", "b5", "5", "b6", "6"]
@ -227,18 +308,57 @@ def midi_to_pitch_class(note: int, key: str | int, scale: str) -> dict:
        npc = sharps[pitch_class]

    if len(npc) > 1:
+        modifier = 1 if (npc[0] == "#") else -1
        return {
-            "text": npc,
+            "text": repeat_text("^", "_", octave) + npc,
            "pitch_class": int(npc[1]),
            "octave": octave,
-            "modifier": 1 if (npc[0] == "#") else -1,
+            "modifier": modifier,
        }

-    return {"text": npc, "pitch_class": int(npc), "octave": octave}
+    return {
+        "text": repeat_text("^", "_", octave) + npc,
+        "pitch_class": int(npc),
+        "octave": octave,
+    }


-def chord_from_roman_numeral(
-    roman: str, name: str = "major", num_octaves: int = 1
+def chord_from_degree(
+    degree: int, name: str, scale: str, root: str | int, num_octaves: int = 1
+) -> list[int]:
+    """Generate chord from scale
+
+    Args:
+        degree (int): Chord degree
+        name (str): Chord type
+        scale (str): Scale name
+        root (str | int): Root for the chord
+        num_octaves (int, optional): Number of octaves. Defaults to 1.
+
+    Returns:
+        list[int]: Created chord as list of midi notes
+    """
+    root = note_name_to_midi(root) if isinstance(root, str) else root
+
+    if (
+        name is None
+        and isinstance(scale, str)
+        and scale.lower().capitalize() == "Chromatic"
+    ):
+        name = "major"
+
+    if name:
+        return named_chord_from_degree(degree, name, root, scale, num_octaves)
+    else:
+        return get_chord_from_scale(degree, root, scale)
+
+
+def named_chord_from_degree(
+    degree: int,
+    name: str = "major",
+    root: int = 60,
+    scale: str = "Major",
+    num_octaves: int = 1,
 ) -> list[int]:
    """Generates chord from given roman numeral and chord name

@ -250,11 +370,74 @@ def chord_from_roman_numeral(
    Returns:
        list[int]: _description_
    """
-    root = parse_roman(roman) - 1
-    tonic = (DEFAULT_OCTAVE * 12) + root + 12
    intervals = CHORDS.get(name, CHORDS["major"])
+    scale_degree = get_scale_notes(scale, root)[degree - 1]
    notes = []
    for cur_oct in range(num_octaves):
-        for iterval in intervals:
-            notes.append(tonic + iterval + (cur_oct * 12))
+        for interval in intervals:
+            notes.append(scale_degree + interval + (cur_oct * 12))
    return notes
+
+
+def resolve_pitch_bend(note_value: float, semitones: int = 1) -> int:
+    """Resolves pitch bend value from float midi note
+
+    Args:
+        note_value (float): Note value as float, eg. 60.41123
+        semitones (int, optional): Number of semitones to scale the pitch bend. Defaults to 1.
+
+    Returns:
+        int: Returns pitch bend value ranging from 0 to 16383. 8192 means no bend.
+    """
+    midi_bend_value = 8192
+    if isinstance(note_value, float) and note_value % 1 != 0.0:
+        start_value = (
+            note_value if note_value > round(note_value) else round(note_value)
+        )
+        end_value = round(note_value) if note_value > round(note_value) else note_value
+        bend_diff = midi_to_freq(start_value) / midi_to_freq(end_value)
+        bend_target = 1200 * log2(bend_diff)
+        # https://www.cs.cmu.edu/~rbd/doc/cmt/part7.html
+        midi_bend_value = 8192 + int(8191 * (bend_target / (100 * semitones)))
+    return (note_value, midi_bend_value)
+
+
+def cents_to_semitones(cents: list) -> tuple[float]:
+    """Tranform cents to semitones"""
+    if cents[0] != 0.0:
+        cents = [0.0] + cents
+    semitone_scale = []
+    for i, cent in enumerate(cents[:-1]):
+        semitone_interval = (cents[i + 1] - cent) / 100
+        semitone_scale.append(semitone_interval)
+    return tuple(semitone_scale)
+
+
+def ratio_to_cents(ratio: float) -> float:
+    """Transform ratio to cents"""
+    return 1200.0 * log2(float(ratio))
+
+
+def monzo_to_cents(monzo) -> float:
+    """
+    Convert a monzo to cents using the prime factorization method.
+
+    Args:
+        monzo (list): A list of integers representing the exponents of the prime factorization
+
+    Returns:
+        float: The value in cents
+    """
+    # Calculate the prime factors of the indices in the monzo
+    max_index = len(monzo)
+    primes = list(islice(gen_primes(), max_index + 1))
+
+    # Product of the prime factors raised to the corresponding exponents
+    ratio = 1
+    for i in range(max_index):
+        ratio *= primes[i] ** monzo[i]
+
+    # Frequency ratio to cents
+    cents = 1200 * log2(ratio)
+
+    return cents
--- a/ziffers/spec/init.py
+++ b/ziffers/spec/init.py
--- a/ziffers/spec/scala.lark
+++ b/ziffers/spec/scala.lark
@ -0,0 +1,24 @@
+?root: lines
+
+lines: (number | ratio | monzo | operation)+
+
+?number: float | int | random_int | random_float
+random_int: "(" int "," int ")"
+random_float: "(" float "," float ")"
+float: /(-?[0-9]+\.[0-9]*)|(\.[0-9]+)/
+int: /-?[0-9]+/
+
+?ratio: frac_ratio | edo_ratio | edji_ratio | decimal_ratio
+frac_ratio: (int | random_int) "/" (int | random_int)
+edo_ratio: (int | random_int) "\\" (int | random_int)
+edji_ratio: (int | random_int) "\\" (int | random_int) "<" (int | random_int) "/"? (int | random_int)? ">"
+decimal_ratio: int "," int
+
+monzo: "[" int+ ">"
+
+operation: (number | ratio | monzo) (operator ((number | ratio | monzo) | sub_operations | operation))+
+!operator: "+" | "-" | "*" | "%" | "&" | "|" | "<<" | ">>"
+sub_operations: "(" operation ")"
+
+%import common.WS
+%ignore WS
--- a/ziffers/spec/ziffers.lark
+++ b/ziffers/spec/ziffers.lark
@ -0,0 +1,99 @@
+    // Root for the rules    
+    ?root: sequence -> start
+    sequence: (pitch_class | repeat_item | assignment | variable | variablelist | rest | dur_change | oct_mod | oct_change | WS | measure | chord | named_roman | cycle | random_integer | random_pitch | random_percent | range | list | repeated_list | lisp_operation | list_op | subdivision | eval | euclid | repeat)*
+    
+    // Pitch classes
+    pitch_class: prefix* (pitch | escaped_pitch)
+    prefix: (octave | duration_chars | escaped_decimal | escaped_octave | modifier)
+    pitch: /-?[0-9TE]/
+    escaped_decimal: "<" decimal ">"
+    escaped_octave: /<-?[0-9]>/
+    octave: /[_^]+/
+    modifier: /[#b]/
+
+    measure: "|"
+
+    // Variable assignment
+    assignment: variable ass_op (list | pitch_class | random_integer | random_pitch | cycle | list_op | repeat_item)
+    ass_op: /[=~]/
+    variable: prefix* variable_char
+    variable_char: /[A-Z]/
+
+    variablelist: variable variable+
+
+    // Durations
+    duration_chars: dotted_dur+
+    dotted_dur: dchar dot*
+    decimal: /-?[0-9]+\.[0-9]+/
+    dchar: /[mklpdcwyhnqaefsxtgujzo]/
+    dot: "."
+   
+    rest: prefix* "r"
+
+    // Chords
+    chord: pitch_class pitch_class+ invert?
+    named_roman: roman_number (("^" chord_name))? invert? // TODO: Add | ("+" number)
+    chord_name: /[a-zA-Z0-9]+/
+    !roman_number: "i" | "ii" | "iii" | "iv" | "v" | "vi" | "vii"
+
+    invert: /%-?[0-9][0-9]*/
+  
+    // Valid as integer
+    number: integer | random_integer | cycle
+    integer: pitch+
+    escaped_pitch: /{-?[0-9]+}/
+
+    // Repeats
+    repeat: "[:" sequence ":" [number] "]"
+    repeat_item: (pitch_class | list | list_op | random_integer | cycle | rest | subdivision | chord | named_roman | variable | range) ":" number
+
+    // List
+    list: prefix* "(" sequence ")"
+    repeated_list: prefix* "(:" sequence ":" [number] ")"
+
+    // Right recursive list operation
+    list_op: list ((operator | list_operator) right_op)+
+    right_op: list | number
+    // Operators that work only on lists: | << >>
+    list_operator: /(\||<<|>>|<>|#|@)(?=[(\d])/
+    // /(\||<<|>>|<>|#|@)(?=[(\d])/
+    // Common operators that works with numbers 3+5 3-5 etc.
+    operator: /(\+|-|\*|\/|%|&|\?|~)/
+
+    // Euclidean cycles
+    // TODO: Support randomization etc.
+    //euclid_operator: (">" | "<") number "," number ["," number] (">" | "<")
+    euclid: list euclid_operator list?
+    ?euclid_operator: /<[0-9]+,[0-9]+(,[0-9])?>/
+    
+    // Lisp like list operation
+    lisp_operator: /([\+\-\*\/%\&])/ 
+    lisp_operation:  "(" lisp_operator WS sequence ")"
+
+    // Subdivision
+    subdivision: "[" subitems "]"
+    subitems: (pitch_class | random_integer | random_pitch | rest | oct_mod | oct_change | WS | chord | named_roman | cycle | subdivision | list | list_op | range | repeat_item)*
+
+    // Control characters modifying future events
+    oct_mod: octave WS
+    oct_change: escaped_octave WS
+    dur_change: (decimal | char_change)
+    char_change: dchar_not_prefix+
+    dchar_not_prefix: /([mklpdcwyhnqaefsxtgujzo](\.)*)(?=[ >)])/
+
+    // Generative rules
+    random_integer: prefix* random_integer_re
+    random_integer_re: /\(-?[0-9]+,-?[0-9]+\)/
+    range: prefix* range_re
+    range_re: /-?[0-9]+\.\.-?[0-9]+/
+    cycle: "<" sequence ">"
+    random_pitch: /(\?)(?!\d)/
+    random_percent: /(%)(?!\d)/
+
+    // Rules for evaluating clauses inside {}
+    eval: "{" ((operation | rest) WS?)+ "}"
+    operation: prefix? atom (operator (sub_operations | operation))*
+    sub_operations: "(" operation ")"
+    atom: number
+
+    %import common.WS
--- a/ziffers/ziffers.lark
+++ b/ziffers/ziffers.lark
@ -1,81 +0,0 @@
-    // Root for the rules    
-    ?root: sequence -> start
-    sequence: (pitch_class | dur_change | oct_mod | oct_change | WS | chord | named_roman | cycle | random_integer | random_pitch | random_percent | range | list | repeated_list | lisp_operation | list_op | subdivision | eval | euclid | repeat)*
-    
-    // Pitch classes
-    pitch_class: prefix* pitch
-    prefix: (octave | duration_chars | escaped_decimal | escaped_octave | modifier)
-    pitch: /-?[0-9TE]/
-    escaped_decimal: "<" decimal ">"
-    escaped_octave: /<-?[0-9]>/
-    octave: /[_^]+/
-    modifier: /[#b]/
-   
-    // Chords
-    chord: pitch_class pitch_class+
-    named_roman: roman_number (("^" chord_name))? // TODO: Add | ("+" number)
-    chord_name: /[a-zA-Z0-9]+/
-    ?roman_number: /iv|v|v?i{1,3}/
-  
-    // Valid as integer
-    number: NUMBER | random_integer | cyclic_number
-    cyclic_number: "<" number (WS number)* ">"
-
-    // Repeats
-    repeat: "[:" sequence ":" [number] "]"
-
-    // List
-    list: prefix* "(" sequence ")"
-    repeated_list: prefix* "(:" sequence ":" [number] ")"
-
-    // Right recursive list operation
-    list_op: list (operator right_op)+
-    right_op: list | number
-    operator: /([\+\-\*\/%]|<<|>>)/
-
-    // Euclidean cycles
-    euclid: list euclid_operator list?
-    ?euclid_operator: /<[0-9]+,[0-9]+(,[0-9])?>/
-    
-    // TODO: Support randomization etc.
-    //euclid_operator: (">" | "<") number "," number ["," number] (">" | "<")
-    
-    // Lisp like list operation
-    lisp_operation:  "(" operator WS sequence ")"
- 
-    // Durations
-    duration_chars: dotted_dur+
-    dotted_dur: dchar dot*
-    decimal: /-?[0-9]+\.[0-9]+/
-    dchar: /[mklpdcwyhnqaefsxtgujzo]/
-    dot: "."
-
-    // Subdivision
-    subdivision: "[" subitems "]"
-    subitems: (pitch_class | WS | chord | cycle | subdivision)*
-
-    // Control characters modifying future events
-    oct_mod: octave WS
-    oct_change: escaped_octave WS
-    dur_change: (decimal | char_change)
-    char_change: dchar_not_prefix+
-    dchar_not_prefix: /([mklpdcwyhnqaefsxtgujzo](\.)*)(?!\d)/
-
-    // Generative rules
-    random_integer: /\(-?[0-9]+,-?[0-9]+\)/
-    range: /-?[0-9]\.\.-?[0-9]/
-    cycle: "<" sequence ">"
-    random_pitch: /(\?)(?!\d)/
-    random_percent: /(%)(?!\d)/
-
-    // Rules for evaluating clauses inside {}
-    // TODO: Support for parenthesis?
-    eval: "{" operation+ "}"
-    operation: atom (operator (sub_operations | operation))*
-    sub_operations: "(" operation ")"
-    atom: (NUMBER | DECIMAL)
-
-    %import common.NUMBER
-    //%import common.SIGNED_NUMBER
-    %import common.DECIMAL
-    %import common.WS
Author	SHA1	Message	Date
Miika Alonen	7cfc92db3d	Changes to triplet characters	2023-12-10 14:45:58 +02:00
Miika Alonen	9bd4ec0ff0	More examples and some minor fixes	2023-06-29 00:03:45 +03:00
Miika Alonen	7d6ba407bd	Added music21 and csound examples	2023-06-28 00:55:56 +03:00
Miika Alonen	fe65c87ed2	Packaging	2023-05-06 19:38:19 +03:00
Miika Alonen	c8a45a3f8b	Degree based notation Added parameter for degree based notation. Using degrees=True integers are interpreted as degrees and 0=Rest.	2023-04-29 17:06:07 +03:00
Miika Alonen	8f5d8adf48	Added pick and select for lists Pick: (1 2 3 4)?4 or (1 2 3 4)?(3 2) Select: (1 2 3 4)~2 or (1 2 3 4)~(2 3)	2023-04-26 21:14:21 +03:00
Miika Alonen	cc3497fd29	Changing py-modules to packages	2023-03-18 22:55:05 +02:00
Miika Alonen	d3edfb5b42	Added build-system	2023-03-18 22:27:18 +02:00
Miika Alonen	c9b6a01ef3	Config changes	2023-03-18 19:32:11 +02:00
Miika Alonen	830cc94744	Updated docs	2023-03-18 02:54:39 +02:00
Miika Alonen	c88f02419d	Updating documentation	2023-03-18 02:51:08 +02:00
Miika Alonen	f0b9de0118	Adding checks if music21 is installed Music21 is optional dependency	2023-03-18 00:01:48 +02:00
Miika Alonen	5d122a90e0	Added parsing for monzos and support for escaped pitch_classes Syntax for monzos supported in scala scales: [-1 1> etc. Support for escaped pitches: {q12 e23 26}	2023-03-16 22:29:24 +02:00
Miika Alonen	882a9a7b4b	Adding support for ratio operations	2023-03-15 23:42:34 +02:00
Miika Alonen	48426fdb0e	Adding scala_parser to zparse Can parse scales as options, for example: zparse("0..8", scale="17/16 19/16")	2023-03-15 23:08:12 +02:00
Miika Alonen	8929940328	Fixes for edji ratio	2023-03-15 22:59:06 +02:00
Miika Alonen	95b69d1d41	Added support for m-EDO and EDJI notation	2023-03-15 22:53:31 +02:00
Miika Alonen	c30ff41f1f	Add options to SampleList	2023-03-11 23:34:01 +02:00
Miika Alonen	c8c590d7ed	Refactor multiple samples as SampleList	2023-03-10 20:11:38 +02:00
Miika Alonen	bd2a1587d7	Added experimental scala scale parser	2023-03-10 18:41:50 +02:00
Miika Alonen	545ae1f92a	Added beat to events	2023-03-06 21:22:37 +02:00
Miika Alonen	7e015a635d	Added total_duration and total_beats	2023-03-06 20:40:30 +02:00
Miika Alonen	745632ce59	Updating cyclic zip	2023-03-05 21:58:32 +02:00
Miika Alonen	323b41b36e	Added samples and prefixes to variables	2023-03-05 18:45:14 +02:00
Miika Alonen	ea0e9ae0cd	Fixed some bugs and added new tests New test_multi_03 can be used to test multiple variables at once. Based on new collect function that can be used to collect n variables from parsed Ziffers.	2023-03-05 13:31:52 +02:00
Miika Alonen	004578e56e	Added len to Ziffers object	2023-03-04 22:37:40 +02:00
Miika Alonen	7bf6669cd1	Fixed some issues	2023-03-04 22:05:34 +02:00
Miika Alonen	13f68f7ee7	Moving things around	2023-03-04 12:36:09 +02:00
Miika Alonen	5fd03fac6b	Added Function to evaluated items	2023-03-03 20:11:55 +02:00
Miika Alonen	115da4c96c	Added cycles to operations	2023-03-02 20:56:49 +02:00
Miika Alonen	bc779b0c81	Added arpeggios and cyclic zip operation	2023-03-02 20:45:32 +02:00
Miika Alonen	6167c4be33	Fix for chromatic chord names	2023-03-02 01:34:48 +02:00
Miika Alonen	f60e21c341	Adding duration for roman chords	2023-03-02 01:18:54 +02:00
Miika Alonen	3d543601e6	Fix for some chord issues	2023-03-02 01:07:05 +02:00
Miika Alonen	7d35ce0118	Adding dim back	2023-03-02 00:45:27 +02:00
Miika Alonen	f996e57acf	Refactored roman numeral chords	2023-03-02 00:40:46 +02:00
Miika Alonen	9e37bd366f	Fixed Subdivision in normal repeats	2023-02-26 22:32:50 +02:00
Miika Alonen	da020cc3a2	Fixed some bugs	2023-02-26 21:41:30 +02:00
Miika Alonen	78295da323	Added measures and fixed some bugs	2023-02-26 20:42:20 +02:00
Miika Alonen	443d4e6639	Adding chord inversion	2023-02-26 13:16:19 +02:00
Miika Alonen	ef27557c76	Small fix for old code	2023-02-26 00:28:55 +02:00
Miika Alonen	1168449dfa	Added some helper methods	2023-02-26 00:20:06 +02:00
Miika Alonen	f0e1aca247	Major refactoring Added more items to shorter repeat syntax: 124:3 A=(1 2) A:4 Prefixes now work for more items: q..r qs(1 2 3) Duration support for list operations: (q1 e3)+(1 4 3 5)	2023-02-25 23:47:28 +02:00
Miika Alonen	7a2f0b5a0a	Added repeat item to subdivisions	2023-02-25 02:20:48 +02:00
Miika Alonen	864b110931	Adding rest and subdivision to new repeat syntax	2023-02-24 16:51:10 +02:00
Miika Alonen	0d285a63eb	Added cycle to new repeat syntax	2023-02-24 16:39:21 +02:00
Miika Alonen	f4f819291a	Added support for cycles in new repeat syntax	2023-02-24 16:32:41 +02:00
Miika Alonen	595fc346ae	Added new repeat syntax Shortened syntax for repeats: 1:5 (1,5):4 (1 2 3):4	2023-02-24 16:16:24 +02:00
Miika Alonen	bcc86f4cfe	Added two options for variables Pre-evaluated: A=(1,4) Just a clone: A~(1,4)	2023-02-23 21:42:12 +02:00
Miika Alonen	3e32c9ecf2	Added variable assingment	2023-02-23 19:11:06 +02:00
Miika Alonen	6dd8333007	Fixed bug with subdivisions and added tests	2023-02-23 18:22:43 +02:00
Miika Alonen	63dab6fbdf	Adding cycles for operations	2023-02-22 23:31:50 +02:00
Miika Alonen	805d7af216	Changed default options to immutable MappingProxyType Options as immutable dicts are less prone to bugs	2023-02-22 22:14:10 +02:00
Miika Alonen	4dd0f12aca	Fix for repeats	2023-02-22 19:41:17 +02:00
Miika Alonen	5e78ea9c4c	Added reversed ranges	2023-02-22 19:23:24 +02:00
Miika Alonen	77cf10c95c	Added lru_cache and range support for operations	2023-02-22 15:47:07 +02:00
Miika Alonen	acbfacee59	Simple support for re-evaluating cycles with get_item	2023-02-21 20:56:06 +02:00
Miika Alonen	973d3eab2b	Added range evaluation and more operators	2023-02-21 19:48:37 +02:00
Miika Alonen	e9c0731d7e	Refactored evaluation for subdivisions	2023-02-21 03:16:00 +02:00
Miika Alonen	a9e2936a29	Some refactoring	2023-02-20 18:22:33 +02:00
Miika Alonen	65257217c5	Fix for subdiv looping	2023-02-20 00:29:56 +02:00
Miika Alonen	ffbff359fa	Some fixes	2023-02-19 23:55:56 +02:00
Miika Alonen	9a4c970b95	Added euclidean evaluation	2023-02-19 22:56:11 +02:00
Miika Alonen	cca08b250f	Evaluation of ListOperation for repeats	2023-02-19 21:34:18 +02:00
Miika Alonen	bae01efa58	Fixing some issues with repeats	2023-02-19 19:02:42 +02:00
Miika Alonen	c7a905f5a0	Added support for mote item in cyclic	2023-02-19 12:45:50 +02:00
Miika Alonen	f417f0282e	Added evaluation for subdivision	2023-02-18 12:45:32 +02:00
Miika Alonen	5e9bf94d42	Added rest and update in RepeatedSequence	2023-02-17 17:28:23 +02:00
Miika Alonen	a7da9795a5	Added string replacement function for future use	2023-02-16 22:58:54 +02:00
Raphael Forment	0816ac65db	Improvements in packaging. The ziffers.lark file is not included in the installed package. This was preventing users from importing the ziffers package from elsewhere.	2023-02-16 07:39:51 +01:00
Miika Alonen	1ff7e3b6d2	Added rest and chords to music21 converter	2023-02-16 00:41:31 +02:00
Miika Alonen	f6c6497319	Added rest and infinite indexing Preliminary support for rest: q 1 r 3 er 4 etc. Currently supports only single character prefixes like: qr er.	2023-02-15 23:14:53 +02:00
Miika Alonen	10f66d0027	Some refactoring	2023-02-15 19:44:40 +02:00
Miika Alonen	726dc42902	Added repeats Added evaluation of [: :] and (: :) and cycles: (: (1,5) <q e <e s>> (2,3) :6) ... etc.	2023-02-14 22:41:41 +02:00
Miika Alonen	90d7b0bdff	Added notes function to get list of notes	2023-02-13 17:55:04 +02:00
Miika Alonen	e240c45693	Added basic music21 converter	2023-02-13 17:28:42 +02:00
Miika Alonen	7cc89d3333	Added frequency and default key&scale	2023-02-13 01:21:55 +02:00
Miika Alonen	4f019bfda4	Refactored list operation to use product Evaluated pitches are now stored to evaluated_valued variable	2023-02-12 22:05:48 +02:00
Raphaël Forment	70b56dbc52	Merge pull request #1 from Bubobubobubobubo/lark Lark implementation	2023-02-12 14:59:28 +01:00