D# Viennese trichord/F
The D# Viennese trichord chord consists of the D# (Perfect unison), E (Minor second) and A (Diminished fifth) notes, with F as the bass note.

How to play the D# Viennese trichord/F chord
- Play F as the lowest bass note in the left hand
- Find D# (Root) on the piano keyboard
- Add E (Minor second) — 1 semitone above D#
- Add A (Diminished fifth) — 6 semitones above D#
- Press all 4 notes simultaneously to sound the D# Viennese trichord/F chord