B9 chord
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)