Chord sequence
B7 E7 B7 E7 B7 F♯7 E7 B7 C7
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 B major
Over B7 · V7/IV
Mode 5 of Major
Over E7 · IV7
Mode 4 of Melodic Minor
Over B7 · I7
Over F#7 · V7
Over C7 · subV7