The B-flat dominant ninth chord (abbreviated "Bb9 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-flat dominant seventh chord.

In practice, the fifth (F) is sometimes omitted from the Bb9 chord because it's not always possible to play all notes simultaneously.

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

Bb9 chord on piano

Bb9 chord on guitar

Bb9 chord on ukulele

Bb9 chord on the staff