Chords in Eb Locrian

Eb Locrian is built from the notes Eb, Fb, Gb, Ab, Bbb, Cb and Db. Its scale carries 8 flats. Harmonising that scale in thirds gives seven chords — 3 majors, 3 minors and 1 diminished — starting on Ebdim as the iø. The chord on the fifth degree is Bbb, a major bV, so Eb Locrian has the leading tone that makes a Bbb-to-Ebdim cadence sound final.

Beyond those seven, Eb Locrian commonly borrows Eb (I), Fm (ii), Gm (iii), Ab (IV) and Bb (V) from the parallel major — the mixture chords that give a progression somewhere unexpected to go.