The Locrian Mode
Locrian lowers both the 2nd and 5th degrees of minor — and that flattened 5th does something none of the other modes do: it makes the tonic chord itself unstable.
What is the Locrian mode?
The Locrian mode is built on the 7th degree of a major scale. It takes the minor scale's flattened 2nd, 3rd, 6th, and 7th degrees (much like Phrygian) and adds one more: a flattened 5th degree as well.
Scale degrees: 1, ♭2, ♭3, 4, ♭5, ♭6, ♭7. It's the only mode of the major scale to lower the 5th degree — and that change has a bigger consequence than it might look like.
The diminished tonic: why "home" doesn't feel stable
Every other mode's tonic triad is either major (Ionian, Lydian, Mixolydian) or minor (Dorian, Phrygian, Aeolian) — both stable chord qualities that can comfortably serve as "home." Locrian's tonic triad, built from its 1st, ♭3rd, and ♭5th degrees, is diminished. A diminished triad is inherently tense and wants to resolve somewhere else, which is exactly why Locrian is rarely used as a genuine tonal center — its "home" chord doesn't want to sit still.
Where you'll hear it
Even though full Locrian tunes are rare, its scale and diminished-triad logic are everywhere in practice: they underlie the half-diminished (m7♭5) chord, one of the most common chords in jazz, most famously as the ii chord in minor-key ii–V–i progressions.
Common questions
What is the Locrian mode formula?
H-W-W-H-W-W-W. Scale degrees are 1, ♭2, ♭3, 4, ♭5, ♭6, ♭7 — a minor scale with both the 2nd and 5th degrees lowered.
Why is Locrian rarely used as a true tonal center?
Its tonic triad (1, ♭3, ♭5) is diminished rather than major or minor. A diminished chord is inherently unstable and wants to resolve, making it a poor choice as a resting "home" chord.
What is Locrian's characteristic note?
The flat 5th (♭5), which turns the tonic triad diminished. Combined with the flat 2nd, it makes Locrian the darkest and most unstable of the seven modes.
Where does the Locrian sound show up in music?
Rarely as a full tonal center, but its scale and diminished tonic triad underlie half-diminished (m7♭5) chords, which appear constantly in jazz ii-V-i progressions in minor keys.
Play Locrian on your instrument
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