A9
9 · A – C♯ – E – G – B
- AR
- C♯3
- E5
- G♭7
- B9
hear it, browse voicings, or tap notes to name any chord
Guitar voicings
Piano
- Root
- Third / sus
- Fifth
- Sixth / seventh
- Extension
About the A9 chord
The A9 chord (9) is made up of 5 notes — A is the root, C♯ the major third, E the perfect fifth, G the minor seventh and B the ninth. It extends a dominant seventh chord with a ninth stacked above the seventh.
On guitar, A9 chords are most often played in open position: 502423. Let the open A string ring out. The diagrams above show 4 playable voicings in all.
Ninth chords extend the dominant seventh into a rich, funky sound at home in funk and jazz.
Common questions
- What notes are in the A9 chord?
- The A9 chord contains the notes A, C♯, E, G and B.
- How do you play A9 on guitar?
- A common open-position shape is 502423. The diagrams above show 4 playable voicings you can strum or hear.
- What intervals make up the A9 chord?
- The A9 chord is built from the root (A), a major third (C♯), a perfect fifth (E), a minor seventh (G) and a ninth (B).
More than a chord chart
The chart above is just the start. Open A9 in the finder to hear it on guitar and piano and browse every playable voicing side by side. Or switch to Name my chord — tap frets or keys and MobileChords identifies the chord you're playing, inversions and slash chords included.