The B dominant ninth chord (abbreviated "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 dominant seventh chord.

In practice, the fifth (F) is sometimes omitted from the B9 chord because it's not always possible to play all notes simultaneously.

Name
B dominant ninth chord
Notes
B D F A C
Intervals
1 3 5 7 9
Chord symbol
B9
Type
pentad (five-note chord)

B9 chord on piano

B9 chord on guitar

B9 chord on ukulele

B9 chord on the staff