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

How to play the Ab 11/G chord
- Play G 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 Gb (Minor seventh) — 10 semitones above Ab
- Add Bb (Major ninth) — 14 semitones above Ab
- Add Db (Perfect eleventh) — 17 semitones above Ab
- Press all 7 notes simultaneously to sound the Ab 11/G chord