code: def add_notes(self, note, duration=None):
          
          if self.instrument != None:
              if not self.instrument.can_play_notes(note):
                  raise InstrumentRangeError, \
                      "Note '%s' is not in range of the instrument (%s)" % (note,
                          self.instrument)
          if duration == None:
              duration = 4
  
          # Check whether the last bar is full, if so create a new bar and add the
          # note there
          if len(self.bars) == 0:
              self.bars.append(Bar())
          last_bar = self.bars[-1]
          if last_bar.is_full():
              self.bars.append(Bar(last_bar.key, last_bar.meter))
              # warning should hold note if it doesn't fit
  
          return self.bars[-1].place_notes(note, duration)
docs: Add a Note, note as string or NoteContainer to the last Bar.
  
          If the Bar is full, a new one will automatically be created.
  
          If the Bar is not full but the note can't fit in, this method will
          return False. True otherwise.
  
          An InstrumentRangeError exception will be raised if an Instrument is
          attached to the Track, but the note turns out not to be within the
          range of the Instrument.