Abadd9 chord
Ab added ninth
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ukulele fretboard
G
Gb
G
Ab
A
Bb9
B
C
Db
D
Eb
E
F
Gb
G
Bb
C
C
Db
D
Eb5
E
F
Gb
G
Ab
A
Bb
B
C
Eb
E
Eb
E
F
Gb
G
Ab1
A
Bb
B
C
Db
D
Eb
E
Ab
A
Ab
A
Bb
B
C3
Db
D
Eb
E
F
Gb
G
Ab
A
C
3
5
7
10
The Abadd9 chord has the formula 1, 3, 5, 9 with notes Ab, C, Eb, Bb
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.