Db 11/F
The Db 11 chord consists of the Db (Perfect unison), F (Major third), Ab (Perfect fifth), Cb (Minor seventh), Eb (Major ninth) and Gb (Perfect eleventh) notes, with F as the bass note.

How to play the Db 11/F chord
- Play F as the lowest bass note in the left hand
- Find Db (Root) on the piano keyboard
- Add F (Major third) — 4 semitones above Db
- Add Ab (Perfect fifth) — 7 semitones above Db
- Add Cb (Minor seventh) — 10 semitones above Db
- Add Eb (Major ninth) — 14 semitones above Db
- Add Gb (Perfect eleventh) — 17 semitones above Db
- Press all 7 notes simultaneously to sound the Db 11/F chord