Chord sequence
Em7♭5 A7alt Fm7 B♭7 Cmaj7
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
Chords 1 to 2
Em7b5 A7alt
Chords 3 to 5
Fm7 Bb7 Cmaj7
Over Em7b5 · iiiø7
Mode 7 of Major
Over A7alt · V7alt/ii
Mode 7 of Melodic Minor
Over Fm7 · iv7
Mode 2 of Major
Over Bb7 · ♭VII7
Mode 4 of Melodic Minor
Over Cmaj7 · Imaj7
The major scale and its modes are the most commonly used scales in western music.