Chords in Eb Mixolydian

Eb Mixolydian is built from the notes Eb, F, G, Ab, Bb, C and Db. Its scale carries 4 flats. Harmonising that scale in thirds gives seven chords — 3 majors, 3 minors and 1 diminished — starting on Eb as the I. The chord on the fifth degree is Bbm rather than a major V, so Eb Mixolydian has no leading tone and resolves by step and colour instead of by dominant pull — the sound that separates it from a plain Eb minor.

Beyond those seven, Eb Mixolydian commonly borrows Ebm (i), Fdim (iiø), Gb (bIII), Abm (iv) and Cb (bVI) from the parallel minor — the mixture chords that give a progression somewhere unexpected to go.