Chord
C♯dim7 is a diminished seventh chord with the notes C♯, E, G, B♭. Also written C♯°7. The same chord spelled from D♭ is D♭dim7.
| Note | Interval | Semitones |
|---|---|---|
| C♯ | root | 0 |
| E | minor 3rd | 3 |
| G | diminished 5th | 6 |
| B♭ | diminished 7th | 9 |
| Root position | C♯ – E – G – B♭ | |
| 1st inversion | E – G – B♭ – C♯ (C♯dim7/E) | |
| 2nd inversion | G – B♭ – C♯ – E (C♯dim7/G) | |
| 3rd inversion | B♭ – C♯ – E – G (C♯dim7/B♭) |
A diminished seventh chord stacks three minor 3rds. It divides the octave into four equal parts, so the same four notes form diminished chords on four different roots; it often replaces a dominant chord.
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