code: def add_note(self, note, octave=None, dynamics={}):
          if type(note) == str:
              if octave is not None:
                  note = Note(note, octave, dynamics)
              elif len(self.notes) == 0:
                  note = Note(note, 4, dynamics)
              else:
                  if Note(note, self.notes[-1].octave) < self.notes[-1]:
                      note = Note(note, self.notes[-1].octave + 1, dynamics)
                  else:
                      note = Note(note, self.notes[-1].octave, dynamics)
          if not hasattr(note, 'name'):
              raise UnexpectedObjectError("Object '%s' was not expected. "
                      "Expecting a mingus.containers.Note object." % note)
          if note not in self.notes:
              self.notes.append(note)
              self.notes.sort()
          return self.notes