Chord · Altered Dom.
A7♭5♯9 — A Altered ♭5♯9
A7♭5♯9 is the A altered ♭5♯9 chord. It is built on the root A with major 3rd (C♯), diminished 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♭5♯9.
- Root
- A
- Quality
- Altered ♭5♯9
- Formula
- 1 3 ♭5 ♭7 ♯9
- Notes
- A C♯ E♭ G B♯
On the keyboard
The notes of A7♭5♯9
| Degree | Note | Interval from the root | Pitch |
|---|---|---|---|
| 1 | A | root | A3 |
| 3 | C♯ | major 3rd | C♯4 |
| ♭5 | E♭ | diminished 5th | E♭4 |
| ♭7 | G | minor 7th | G4 |
| ♯9 | B♯ | augmented 9th | B♯4 |
Other altered dom. on A
Altered ♭5♯9 chords on every root
Part of the chord reference. See also the scales and the keys.