Chord · 7ths
C♯dim7 — C♯ Diminished 7th
C♯dim7 is the C♯ diminished 7th chord. It is built on the root C♯ with minor 3rd (E), diminished 5th (G) and diminished 7th (B♭) above it — the formula 1 ♭3 ♭5 𝄫7, sounding the notes C♯ E G B♭. On the piano it sits at C# (octave 4) and above in the library's voicing; the same 4 notes in any octave are still C♯dim7.
- Root
- C♯
- Quality
- Diminished 7th
- Formula
- 1 ♭3 ♭5 𝄫7
- Notes
- C♯ E G B♭
On the keyboard
Right-hand fingering for this voicing: 1–2–3–5 (1 is the thumb).
The notes of C♯dim7
| Degree | Note | Interval from the root | Pitch |
|---|---|---|---|
| 1 | C♯ | root | C♯4 |
| ♭3 | E | minor 3rd | E4 |
| ♭5 | G | diminished 5th | G4 |
| 𝄫7 | B♭ | diminished 7th | B♭4 |
Other 7ths on C♯
Diminished 7th chords on every root
Part of the chord reference. See also the scales and the keys.