A9
9 · A – C♯ – E – G – B
- AR
- C♯3
- E5
- G♭7
- B9
Guitar voicings
Piano
- Root
- Third / sus
- Fifth
- Sixth / seventh
- Extension
About the A9 chord
The A9 chord (9) is built from A (the root), C♯ (a major third), E (a perfect fifth), G (a minor seventh) and B (a ninth). Ninth chords extend the dominant seventh into a rich, funky sound at home in funk and jazz.