A# Petrushka chord/C#
The A# Petrushka chord chord consists of the A# (Perfect unison), B (Minor second), D (Major third), E (Diminished fifth), F (Perfect fifth) and G# (Minor seventh) notes, with C# as the bass note.

How to play the A# Petrushka chord/C# chord
- Play C# as the lowest bass note in the left hand
- Find A# (Root) on the piano keyboard
- Add B (Minor second) — 1 semitone above A#
- Add D (Major third) — 4 semitones above A#
- Add E (Diminished fifth) — 6 semitones above A#
- Add F (Perfect fifth) — 7 semitones above A#
- Add G# (Minor seventh) — 10 semitones above A#
- Press all 7 notes simultaneously to sound the A# Petrushka chord/C# chord