Chord sequence
Fm7 B♭7
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 Eb major
All the chords
The building block of jazz harmony: a minor 7th chord on the 2nd degree moving up a fourth to the dominant 7th on the 5th.
A two-chord vamp of a minor 7th on i and a dominant 7th on IV, both from one Dorian scale.
Over Fm7 · ii7
Mode 2 of Major
Over Bb7 · V7
Mode 5 of Major