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

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