C6/9 chord
C six nine
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G
F#
G
G#
A6
A#
B
C
C#
D
D#
E
F
F#
G
A
C
C
C#
D9
D#
E
F
F#
G
G#
A
A#
B
C
D
E
D#
E3
F
F#
G
G#
A
A#
B
C
C#
D
D#
E
E
A
G#
A
A#
B
C1
C#
D
D#
E
F
F#
G
G#
A
C
3
5
7
10
The C6/9 chord has the formula 1, 3, 6, 9 with notes C, E, A, D
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.