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

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