Chord sequence
E♭m7 A♭7 Adim7 B♭maj7
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 Bb major
Chords 1 to 2
Ebm7 Ab7
Over Ebm7 · iv7
Mode 2 of Major
Over Ab7 · ♭VII7
Mode 4 of Melodic Minor
Over Adim7 · vii°7
Mode 7 of Harmonic Minor
Over Bbmaj7 · Imaj7
The major scale and its modes are the most commonly used scales in western music.