Chords in B Mixolydian

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

Beyond those seven, B Mixolydian commonly borrows Bm (i), C#dim (iiø), D (bIII), Em (iv) and G (bVI) from the parallel minor — the mixture chords that give a progression somewhere unexpected to go.