A major ninth chord

Amaj9 chord for piano with keyboard diagram.
Explanation: The A major ninth is a five note chord and can be regarded as a Amaj7 with an added ninth. It is often abbreviated as Amaj9 (should not be confused with A9).
Theory: The Amaj9 chord is constructed with a root, a major third, a perfect fifth, a major seventh and a major ninth.

Amaj9

Amaj9 chord diagram
Notes: A - C# - E - G# - B

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A chord categories

A Am A7 Am7 Amaj7 A6 Am6 A6/9 A5 A9 Am9 Amaj9 A11 A13 Aadd A7-5 A7+5 Asus Adim Aaug