B♭ Dominant 7th
::
B♭
D
F
A♭
G
D
A
E
3
♭7
B♭
5
⬤
B♭
5
⬤
♭7
⬤
3
⬤
♭7
B♭
⬤
3
⬤
B♭
5
⬤
⬤
5
3
♭7
⬤ ⬤
3
⬤ ⬤