AKA: Bb7(b5), Bb7/b5, Bb7(-5), Bb7 Flat 5, Bb Dominant 7th b5, Bb Dominant Seventh Flat Fifth
Notes:
B♭, D, F♭, A♭
Intervals:
R, 3°, dim5°, m7°
Left hand:
B♭ + F♭7
(A# + E7)
Fingering:
2 + 5 (bass pattern)
or
3 or 4 + 2 (counter bass pattern)