Ab Major 7th sharp 11th chords Ab Major 7#11 on a piano Formula: 1-3-5-7-#11 Notes: Ab-C-Eb-G-D chord suffix: AbMaj7#11 Use these charts to create your own AbMaj7#11 chord or play a AbMaj7#11 melody. Ab Major 7#11 on a pianoAb major 7th sharp 11th chord on a guitar