Db add11/Abb
The Db add11 chord consists of the Db (Perfect unison), F (Major third), Ab (Perfect fifth) and Gb (Perfect eleventh) notes, with Abb as the bass note.

How to play the Db add11/Abb chord
- Play Abb 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 Gb (Perfect eleventh) — 17 semitones above Db
- Press all 5 notes simultaneously to sound the Db add11/Abb chord