Locrian Natural 2 · Jazz Wiki

Plain Locrian has a problem: its 2nd degree sits a flat 9 above the root, and that half-step rub against the root sounds like a bruise, not a color. Locrian Natural 2 fixes exactly that one note — raising the ♭2 to a natural 2 — and in doing so turns the half-diminished chord’s 9th from something you dodge into something you lean on.

What it is and where it comes from

Locrian Natural 2 is the sixth mode of The Melodic Minor Scale: build a melodic minor scale and start counting from its sixth degree, and you get this collection. That parentage is the whole story of why melodic minor modes work the way they do — each mode inherits the parent scale’s built-in tensions, so instead of memorizing seven unrelated scales, you’re really just learning to hear one scale from seven different “home” notes.

Interval formula: 1 – 2 – ♭3 – 4 – ♭5 – ♭6 – ♭7
D Locrian ♮2 = D – E – F – G – A♭ – B♭ – C (6th mode of F melodic minor)
B Locrian ♮2 = B – C♯ – D – E – F – G – A (6th mode of D melodic minor)
C Locrian ♮2 = C – D – E♭ – F – G♭ – A♭ – B♭ (6th mode of E♭ melodic minor)

Both of the D and B spellings above laid out on the staff:

Compare it directly to ordinary Locrian and the fix is one note:

Locrian: 1 – ♭2 – ♭3 – 4 – ♭5 – ♭6 – ♭7
Locrian ♮2: 1 – 2 – ♭3 – 4 – ♭5 – ♭6 – ♭7

Why the 9th matters on a half-diminished chord

The half-diminished seventh chord (m7♭5) is built from scale degrees 1–♭3–♭5–♭7, and under Chord-Scale Theory the question is always which extra notes — the extensions — are safe to add. Older pedagogy sometimes lumped the 9th in with the general “avoid the note a half step above a chord tone” rule and treated it with suspicion on any minor-quality chord. But the real culprit was always the ♭9 specifically: a half step above the root is genuinely rough, while a whole step above (the natural 9) is a normal, singable available tension, especially on a chord that’s about to resolve. Locrian ♮2 exists to make that natural 9 — plus a usable ♭13 (the scale’s ♭6, a safe whole step above the ♭5) — the default color instead of an avoid note.

Hearing it in a minor ii–V–i

The mode’s home is the ii chord of a minor ii-V-i, right before the dominant tightens into altered territory and resolves to the tonic minor. In C minor:

Dm7♭5 (ii) – G7alt (V) – Cm (i)
Over Dm7♭5, play D Locrian ♮2: D – E – F – G – A♭ – B♭ – C
E (the 9) and B♭ (the ♭13) are usable color tones; E♭ (the ♭9 of plain Locrian) is the note you’re avoiding

Because Locrian ♮2 is just “melodic minor from the 6th,” many players don’t bother naming the mode at all — they simply think “melodic minor a minor third above the ii chord’s root” (F melodic minor over Dm7♭5) and let the natural 9 fall out automatically. It’s the same melodic-minor-as-a-toolkit logic used for altered dominants and minor-key ii-V’s generally. In practice, plenty of players skip the refinement entirely and just play plain Locrian, quietly avoiding the 9 rather than reharmonizing their scale choice — which works fine but leaves color on the table.

♫ Listen

Miles Davis (feat. John Coltrane & Bill Evans) — “Stella by Starlight” (1958 session, released on '58 Sessions Featuring Stella by Starlight, 1991): Stella by Starlight opens right on Em7♭5–A7♭9 with no immediate resolution — listen to how Evans and Coltrane color that opening half-diminished chord, favoring the natural 9 rather than treating it as bare and dissonant.
Bill Evans Trio — “Autumn Leaves” (Portrait in Jazz, 1959): Autumn Leaves carries a textbook minor ii-V-i (Am7♭5–D7–Gm); Evans’ scalar lines over the ii chord, locked in with Scott LaFaro’s bass, trace the natural-9 sound this mode is built for.