Ab m13
The Ab m13 chord consists of the Ab (Perfect unison), Cb (Minor third), Eb (Perfect fifth), Gb (Minor seventh), Bb (Major ninth) and F (Major thirteenth) notes.

How to play the Ab m13 chord
- Find Ab (Root) on the piano keyboard
- Add Cb (Minor third) — 3 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 F (Major thirteenth) — 21 semitones above Ab
- Press all 6 notes simultaneously to sound the Ab m13 chord