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A Dominant 9th Chord (A9)

Notes: A, C♯, E, G, B. Tap any diagram to hear it.

A9
Notes
AC♯EGB
Formula
1 – 3 – 5 – ♭7 – 9

A9 on guitar

Fret 2 · most common
5-4-2-0-0-0
Fret 5
5-7-5-6-5-7
Fret 8
x-0-9-9-8-9

Strings from low (left) to high (right). Numbers are fingers: 1 index, 2 middle, 3 ring, 4 pinky. × = don’t play, ○ = open string.

A9 on ukulele

Fret 1 · most common
2-1-3-2
Fret 4
4-7-5-4
Fret 9
12-11-9-12

A9 on piano

Other A chords

AAmA7Amaj7Am7Asus2Asus4AdimAaugA6Am6Aadd9A7sus4Am7♭5Adim7

Dominant 9th chords in other keys

C9C♯9D9E♭9E9F9F♯9G9A♭9B♭9B9

About the A Dominant 9th chord

Dominant ninth chords extend the seventh chord with a ninth, for the rich sound of funk, soul and jazz. A9 is built from the root (A), major third (C♯), perfect fifth (E), minor seventh (G), major ninth (B).

Frequently asked questions

What notes are in the A Dominant 9th chord?

The A9 chord is made of A, C♯, E, G, B: the root, major third, perfect fifth, minor seventh, major ninth.

How do you play A9 on guitar?

The most common fingering is 5-4-2-0-0-0, from the low E string to the high E string (x = don’t play that string, 0 = open string).

How do you play A9 on piano?

Press A, C♯, E, G, B together. In root position the lowest note is A.