The A-flat added ninth chord (abbreviated "Abadd9 chord") is a four-note chord consisting of the notes A, C, E, and B. The chord is formed by adding a major ninth to a A-flat major chord.

Often, a major second is played instead of the major ninth since they are the same note.

Name
A-flat added ninth chord
Synonym
A-flat added second chord
Notes
A C E B
Intervals
1 3 5 9
Chord symbol
Aadd9
Alternative symbols
A(add9) Aadd2 A(add2)
Type
Tetrad (four-note chord)

Abadd9 chord on piano

Abadd9 chord on guitar

Abadd9 chord on ukulele

Abadd9 chord on the staff