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

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