The A major ninth chord (abbreviated "Amaj9 chord") is a five-note chord consisting of the notes A, C, E, G, and B. The chord is formed by adding a major ninth to a A major seventh chord.

In practice, the fifth (E) is sometimes omitted from the Amaj9 chord because it's not always possible to play all notes simultaneously.

Name
A major ninth chord
Notes
A C E G B
Intervals
1 3 5 7 9
Chord symbol
Amaj9
Alternative symbols
A9 Ama9 AMA9 AM9
Type
Pentad (five-note chord)

Amaj9 chord on piano

Amaj9 chord on guitar

Amaj9 chord on ukulele

Amaj9 chord on the staff