B9 chord
B dominant ninth
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G
F#
G
G#
A
A#
B1
C
C#
D
D#
E
F
F#
G
B
C
C
C#
D
D#3
E
F
F#
G
G#
A
A#
B
C
D#
E
D#
E
F
F#
G
G#
Ab7
A#
B
C
C#
D
D#
E
A
A
G#
A
A#
B
C
C#9
D
D#
E
F
F#
G
G#
A
C#
3
5
7
10
The B9 chord has the formula 1, 3, b7, 9 with notes B, D#, A, C#
The dominant ninth chord is mostly used in funk, blues and some rock music. It is usually played without the 5th on the ukulele.