Chord
C♯m7♭5 is a half-diminished seventh chord with the notes C♯, E, G, B. Also written C♯ø, C♯–7♭5. The same chord spelled from D♭ is D♭m7♭5.
| Note | Interval | Semitones |
|---|---|---|
| C♯ | root | 0 |
| E | minor 3rd | 3 |
| G | diminished 5th | 6 |
| B | minor 7th | 10 |
| Root position | C♯ – E – G – B | |
| 1st inversion | E – G – B – C♯ (C♯m7♭5/E) | |
| 2nd inversion | G – B – C♯ – E (C♯m7♭5/G) | |
| 3rd inversion | B – C♯ – E – G (C♯m7♭5/B) |
A half-diminished chord (m7♭5) is a diminished triad with a minor 7th added. It is the vii chord of major keys and the ii chord of minor keys, as in the minor ii–V–i.
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