Chord sequence
A♭m7♭5 G7♯11
In every key
Four-note rootless voicings in their two forms, with the 3rd or the 7th on the bottom, played over the root.
Heard in C major
Over Abm7b5 · ?
Mode 6 of Melodic Minor
Over G7#11 · V7♯11
Mode 4 of Melodic Minor