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

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