Ab major ninth chord
Abmaj9 chord for piano with keyboard diagram.
Explanation: The Ab major ninth is a five note chord and can be regarded as a Abmaj7 with an added ninth. It is often abbreviated as Abmaj9 (should not be confused with Ab9).
Theory: The Abmaj9 chord is constructed with a root, a major third, a perfect fifth, a major seventh and a major ninth.
Notes: Ab - C - Eb - G - Bb