Ab maj13/Db
The Ab maj13 chord consists of the Ab (Perfect unison), C (Major third), Eb (Perfect fifth), G (Major seventh), Bb (Major ninth) and F (Major thirteenth) notes, with Db as the bass note.

How to play the Ab maj13/Db chord
- Play Db as the lowest bass note in the left hand
- Find Ab (Root) on the piano keyboard
- Add C (Major third) — 4 semitones above Ab
- Add Eb (Perfect fifth) — 7 semitones above Ab
- Add G (Major seventh) — 11 semitones above Ab
- Add Bb (Major ninth) — 14 semitones above Ab
- Add F (Major thirteenth) — 21 semitones above Ab
- Press all 7 notes simultaneously to sound the Ab maj13/Db chord