Bb6/9 chord
Bb six nine
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>G
Gb
G
Ab
A
Bb1
B
C
Db
D
Eb
E
F
Gb
G
Bb
C
C
Db
D3
Eb
E
F
Gb
G
Ab
A
Bb
B
C
D
E
Eb
E
F
Gb
G6
Ab
A
Bb
B
C
Db
D
Eb
E
G
A
Ab
A
Bb
B
C9
Db
D
Eb
E
F
Gb
G
Ab
A
C
3
5
7
10
The Bb6/9 chord has the formula 1, 3, 6, 9 with notes Bb, D, G, C
The six nine chord has a rich and somewhat ambiguous sound. It can often be used as a substitute for major chords or major seventh chords.