C♯m7♭5
Half-dim · C♯ – E – G – B
- C♯R
- Em3
- G♭5
- B♭7
Guitar voicings
Piano
- Root
- Third / sus
- Fifth
- Sixth / seventh
- Extension
About the C♯m7♭5 chord
The C♯m7♭5 chord (Half-dim) is built from C♯ (the root), E (a minor third), G (a diminished fifth) and B (a minor seventh). Half-diminished chords are moody and jazzy — most often the ii chord in a minor key.