G♭ Major 7th (♭5)
::
G♭
B♭
C
F
G
D
A
E
3
7
G♭
⬤
3
7
♭5
⬤
G♭
⬤
♭5
⬤
3
⬤
⬤
3
7
♭5
⬤
G♭
⬤
7
♭5
G♭
⬤ ⬤
⬤ ⬤