More examples and some minor fixes

ziffers/classes/items.py

@@ -224,6 +224,10 @@ class Pitch(Event):
     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"""

ziffers/classes/sequences.py

@@ -555,6 +555,8 @@ class ListOperation(Sequence):
                     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(