Chord sequence
C♯7 F♯7 B7 G7 Amaj7
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 F# major
Over C#7 · V7
Mode 5 of Major
Over F#7 · V7/IV
Over B7 · IV7
Mode 4 of Melodic Minor
Over G7 · ?
Mode 6 of Blues
Over Amaj7 · ♭IIImaj7
Mode 4 of Major