Aadd9 chord
A added ninth
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>G
F#
G
G#
A1
A#
B
C
C#
D
D#
E
F
F#
G
A
C
C
C#3
D
D#
E
F
F#
G
G#
A
A#
B
C
C#
E
D#
E5
F
F#
G
G#
A
A#
B
C
C#
D
D#
E
E
A
G#
A
A#
B9
C
C#
D
D#
E
F
F#
G
G#
A
B
3
5
7
10
The Aadd9 chord has the formula 1, 3, 5, 9 with notes A, C#, E, B
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.