The B-sharp dominant minor ninth chord (abbreviated "B#7(b9) chord") is a five-note chord consisting of the notes B, D, F, A, and C. The chord is formed by adding a major ninth to a B-sharp dominant seventh chord.

In practice, the fifth (F) is often omitted from the B#7(b9) chord because it's not always possible to play all notes simultaneously.

Name
B-sharp dominant minor ninth chord
Notes
B D F A C
Intervals
1 3 5 7 9
Chord symbol
B7(b9)
Alternative symbol
B7b9
Type
Pentad (five-note chord)

B#7(b9) chord on piano

B#7(b9) chord on guitar

B#7(b9) chord on ukulele

B#7(b9) chord on the staff