AKA: Bb7 Flat 9, Bb7(b9), Bb7/b9, Bb Dominant 7th b9, Bb Dominant Seventh Flat Nine
Notes:
B♭, D, F, A♭, B
Intervals:
R, 3°, 5°, m7°, m9°
Left hand:
B♭ + A♭dim (A# + G#dim)
Optional:
B♭ + B♭ Major + A♭dim
(A# + A# Major + G#dim)
Fingering:
3 + 2 or 4 + 2
Optional: 4 + 3 + 2