F♯m7♭5
Half-dim · F♯ – A – C – E
- F♯R
- Am3
- C♭5
- E♭7
Guitar voicings
Piano
- Root
- Third / sus
- Fifth
- Sixth / seventh
- Extension
About the F♯m7♭5 chord
The F♯m7♭5 chord (Half-dim) is built from F♯ (the root), A (a minor third), C (a diminished fifth) and E (a minor seventh). Half-diminished chords are moody and jazzy — most often the ii chord in a minor key.