Notes in a chord
The following chord types are recognised:
' ', '5', 'm', 'maj7', 'maj9', 'M7', 'M9', '7', '6', 'm6', 'm7', 'm9', 'm7b5', 'sus', 'sus4', '7sus4', '7#9', '7b9', '9', '13', 'dim', 'dim7', '+', 'aug7', '+7', 'aug', 'sus2', 'add9', 'madd9'
Examples: Am7, G#sus4, Dbm9....