Chord · Altered Dom.
A7♭9♯11 — A Altered ♭9♯11
A7♭9♯11 is the A altered ♭9♯11 chord. It is built on the root A with major 3rd (C♯), perfect 5th (E), minor 7th (G), minor 9th (B♭) and augmented 11th (D♯) above it — the formula 1 3 5 ♭7 ♭9 ♯11, sounding the notes A C♯ E G B♭ D♯. On the piano it sits at A (octave 3) and above in the library's voicing; the same 6 notes in any octave are still A7♭9♯11.
- Root
- A
- Quality
- Altered ♭9♯11
- Formula
- 1 3 5 ♭7 ♭9 ♯11
- Notes
- A C♯ E G B♭ D♯
On the keyboard
The notes of A7♭9♯11
| 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♭ | minor 9th | B♭4 |
| ♯11 | D♯ | augmented 11th | D♯5 |
Other altered dom. on A
Altered ♭9♯11 chords on every root
Part of the chord reference. See also the scales and the keys.