Added arpeggios and cyclic zip operation

examples/music21/music21_example.py

@@ -0,0 +1,8 @@
+from music21 import *
+from sardine import *
+from ziffers import *
+
+
+s = to_music21('(i v vi vii^dim)@(q0 e2 s1 012)',time="4/4")
+
+s.show('midi')