F#7b5 Piano Chord
A tense jazz chord with a tritone replacing the perfect fifth. Often serves as a tritone substitution in jazz progressions — replacing the classic dominant seventh chord.
Recommended voicing
F#4 · A#4 · C5 · E5
With bass · rootless
Left hand
C3 · E3 · A#3
fingers 5–3–1
Right hand
Free
melody / improvisation
Jazz accompaniment with a bass player: the bass supplies the root, leaving the right hand free for melody or improvisation.
Other names for the F#7b5 chord
Other names: F# 7th flat 5
Music theory name: seventh flat five chord
Common name: F# 7b5 chord
Notes and intervals in the F#7b5 chord
| Note | Interval |
|---|---|
| F# | Root |
| A# | Major 3rd |
| C | Diminished 5th |
| E | Minor 7th |
Inversions
1st inversion
A#4 · C5 · E5 · F#5
2nd inversion
C5 · E5 · F#5 · A#5