B♭ Dominant 7th :: B♭ D F A♭

E
B
G
D
A
E
3
5
♭7
B♭
5
3
B♭
5
♭7
♭7
3
B♭
5
♭7
B♭
3
B♭
5
♭7
3
5
3
B♭
♭7
⬤ ⬤
3
⬤ ⬤