C#madd9 chord
C# minor 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#
Eb3
F
F#
G
G#
A
A#
B
C
C#
D
D#
E
E
A
G#
A
A#
B
C
C#1
D
D#
E
F
F#
G
G#
A
C#
3
5
7
10
The C#madd9 chord has the formula 1, b3, 5, 9 with notes C#, E, G#, D#
The minor added ninth chord can be built by taking a minor chord and adding the 9th of the scale. It serves a similar purpose to the minor chord, with the additional ninth extension for flavor.