Chord sequence
C♯m7 F♯7 Bm7 E7
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 A major
All the chords
The I-VI-ii-V turnaround with iii, which shares three notes with the I chord, standing in for the tonic.
Over C#m7 · iii7
Mode 6 of Major
Over F#7 · V7/ii
Mode 5 of Melodic Minor
Over Bm7 · ii7
Mode 2 of Major
Over E7 · V7
Mode 5 of Major