G major ninth chord
Gmaj9 chord for piano with keyboard diagram.
Explanation: The G major ninth is a five note chord and can be regarded as a Gmaj7 with an added ninth. It is often abbreviated as Gmaj9 (should not be confused with G9).
Theory: The Gmaj9 chord is constructed with a root, a major third, a perfect fifth, a major seventh and a major ninth.
Notes: G - B - D - F# - A