Is there anyone could help me?
Autumn leaves:
Cm7 - F7 - BbM7 - EbM7 - Am7(b5) - D7(b9) - Gm6
my teacher says there are two key center here: Bb,Gm and that Gm starts from Am7(b5) but I disagree as I think it starts from D7(b9).
Am7(b5) is part of Bb scale, in particular the following...