F Viennese trichord
The F Viennese trichord chord consists of the F (Perfect unison), F# (Minor second) and B (Diminished fifth) notes.

How to play the F Viennese trichord chord
- Find F (Root) on the piano keyboard
- Add F# (Minor second) — 1 semitone above F
- Add B (Diminished fifth) — 6 semitones above F
- Press all 3 notes simultaneously to sound the F Viennese trichord chord