<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def append_notes(self, notes, root, scale=0):
 """ Append notes to quality :param list[str] notes: notes to append on quality :param str root: root note of chord :param int scale: key scale """

        for note in notes:
            self.append_note(note, root, scale)