F# b5
The F# b5 chord consists of the F# (Perfect unison), A# (Major third) and C (Diminished fifth) notes.

How to play the F# b5 chord
- Find F# (Root) on the piano keyboard
- Add A# (Major third) — 4 semitones above F#
- Add C (Diminished fifth) — 6 semitones above F#
- Press all 3 notes simultaneously to sound the F# b5 chord