Ab m6/Cb
The Ab m6 chord consists of the Ab (Perfect unison), Cb (Minor third), Eb (Perfect fifth) and F (Major sixth) notes, with Cb as the bass note.

How to play the Ab m6/Cb chord
- Play Cb as the lowest bass note in the left hand
- Find Ab (Root) on the piano keyboard
- Add Cb (Minor third) — 3 semitones above Ab
- Add Eb (Perfect fifth) — 7 semitones above Ab
- Add F (Major sixth) — 9 semitones above Ab
- Press all 5 notes simultaneously to sound the Ab m6/Cb chord