C#6/9 chord
C# six nine
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G
F#
G
G#
A
A#6
B
C
C#
D
D#
E
F
F#
G
A#
C
C
C#
D
D#9
E
F
F#
G
G#
A
A#
B
C
D#
E
D#
E
F3
F#
G
G#
A
A#
B
C
C#
D
D#
E
F
A
G#
A
A#
B
C
C#1
D
D#
E
F
F#
G
G#
A
C#
3
5
7
10
The C#6/9 chord has the formula 1, 3, 6, 9 with notes C#, F, 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.