Chord · Altered Dom.
A7♯9 — A Dominant 7th ♯9
A7♯9 is the A dominant 7th ♯9 chord. It is built on the root A with major 3rd (C♯), perfect 5th (E), minor 7th (G) and augmented 9th (B♯) above it — the formula 1 3 5 ♭7 ♯9, sounding the notes A C♯ E G B♯. On the piano it sits at A (octave 3) and above in the library's voicing; the same 5 notes in any octave are still A7♯9.
- Root
- A
- Quality
- Dominant 7th ♯9
- Formula
- 1 3 5 ♭7 ♯9
- Notes
- A C♯ E G B♯
On the keyboard
The notes of A7♯9
| Degree | Note | Interval from the root | Pitch |
|---|---|---|---|
| 1 | A | root | A3 |
| 3 | C♯ | major 3rd | C♯4 |
| 5 | E | perfect 5th | E4 |
| ♭7 | G | minor 7th | G4 |
| ♯9 | B♯ | augmented 9th | B♯4 |
Other altered dom. on A
Dominant 7th ♯9 chords on every root
Part of the chord reference. See also the scales and the keys.