Chord · 9ths
Cdim7/9 — C Diminished 7th / 9th
Cdim7/9 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 Cdim7/9.
- Root
- C
- Quality
- Diminished 7th / 9th
- Formula
- 1 ♭3 ♭5 6 9
- Notes
- C E♭ G♭ A D
On the keyboard
The notes of Cdim7/9
| Degree | Note | Interval from the root | Pitch |
|---|---|---|---|
| 1 | C | root | C4 |
| ♭3 | E♭ | minor 3rd | E♭4 |
| ♭5 | G♭ | diminished 5th | G♭4 |
| 6 | A | major 6th | A4 |
| 9 | D | major 9th | D5 |
Other 9ths on C
Diminished 7th / 9th chords on every root
Part of the chord reference. See also the scales and the keys.