Chord sequence
F♯m7 B7 Em7 A7 Dm7 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 A major
All the chords
Three ii-Vs, each a whole step below the last and the last one the backdoor ii-V: a chain of keys that doesn't arrive until the end.
Over F#m7 · vi7
Mode 6 of Major
Over B7 · V7/v
Mode 5 of Melodic Minor
Over Em7 · ii7/iv
Mode 2 of Major
Over A7 · V7/iv
Over Dm7 · iv7
Over G7 · ♭VII7
Mode 4 of Melodic Minor
Over Amaj7 · Imaj7
The major scale and its modes are the most commonly used scales in western music.