F m9/Ab
The F m9 chord consists of the F (Perfect unison), Ab (Minor third), C (Perfect fifth), Eb (Minor seventh) and G (Major ninth) notes, with Ab as the bass note.

How to play the F m9/Ab chord
- Play Ab as the lowest bass note in the left hand
- Find F (Root) on the piano keyboard
- Add Ab (Minor third) — 3 semitones above F
- Add C (Perfect fifth) — 7 semitones above F
- Add Eb (Minor seventh) — 10 semitones above F
- Add G (Major ninth) — 14 semitones above F
- Press all 6 notes simultaneously to sound the F m9/Ab chord