C#add9 chord
C# added ninth
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G
F#
G
G#5
A
A#
B
C
C#
D
D#
E
F
F#
G
G#
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#add9 chord has the formula 1, 3, 5, 9 with notes C#, F, G#, D#
The added ninth chord can be built by taking a major chord and adding the 9th of the scale. It serves a similar purpose to the major chord, with the additional extension for color or harmonizing with other instruments.