Chord · Altered Dom.
C7♯9 — C Dominant 7th ♯9
C7♯9 is the C dominant 7th ♯9 chord. It is built on the root C with major 3rd (E), perfect 5th (G), minor 7th (B♭) and augmented 9th (D♯) above it — the formula 1 3 5 ♭7 ♯9, sounding the notes C E G B♭ D♯. On the piano it sits at C (octave 4) and above in the library's voicing; the same 5 notes in any octave are still C7♯9.
- Root
- C
- Quality
- Dominant 7th ♯9
- Formula
- 1 3 5 ♭7 ♯9
- Notes
- C E G B♭ D♯
On the keyboard
The notes of C7♯9
| Degree | Note | Interval from the root | Pitch |
|---|---|---|---|
| 1 | C | root | C4 |
| 3 | E | major 3rd | E4 |
| 5 | G | perfect 5th | G4 |
| ♭7 | B♭ | minor 7th | B♭4 |
| ♯9 | D♯ | augmented 9th | D♯5 |
Other altered dom. on C
Dominant 7th ♯9 chords on every root
Part of the chord reference. See also the scales and the keys.