Ab 9/E
The Ab 9 chord consists of the Ab (Perfect unison), C (Major third), Eb (Perfect fifth), Gb (Minor seventh) and Bb (Major ninth) notes, with E as the bass note.

How to play the Ab 9/E chord
- Play E 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
- Press all 6 notes simultaneously to sound the Ab 9/E chord