The A-sharp added ninth chord (abbreviated "A#add9 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-sharp major chord.

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

Name
A-sharp added ninth chord
Synonym
A-sharp 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)

A#add9 chord on piano

A#add9 chord on guitar

A#add9 chord on ukulele

A#add9 chord on the staff