Chord · 9ths
C♯dim7/9 — C♯ Diminished 7th / 9th
C♯dim7/9 is the C♯ diminished 7th / 9th chord. It is built on the root C♯ with minor 3rd (E), diminished 5th (G), major 6th (A♯) and major 9th (D♯) above it — the formula 1 ♭3 ♭5 6 9, sounding the notes C♯ E G A♯ 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 C♯dim7/9.
- Root
- C♯
- Quality
- Diminished 7th / 9th
- Formula
- 1 ♭3 ♭5 6 9
- Notes
- C♯ E G A♯ D♯
On the keyboard
The notes of C♯dim7/9
| Degree | Note | Interval from the root | Pitch |
|---|---|---|---|
| 1 | C♯ | root | C♯4 |
| ♭3 | E | minor 3rd | E4 |
| ♭5 | G | diminished 5th | G4 |
| 6 | A♯ | major 6th | A♯4 |
| 9 | D♯ | major 9th | D♯5 |
Other 9ths on C♯
Diminished 7th / 9th chords on every root
Part of the chord reference. See also the scales and the keys.