The Melodic Minor Scale

Take a minor scale, raise the 6th and 7th degrees, and you get something strange: a scale that’s really just a major scale with a flattened 3rd. That one move quietly solved a centuries-old melodic problem and, in the process, handed twentieth-century jazz an entire parallel universe of chord-scale sounds — the source of the altered scale, lydian dominant, and half a dozen other modern colors.

Why raise the 6th and 7th

Harmonic minor gets the leading tone right (♮7 pulls hard into the tonic) but leaves a huge gap between ♭6 and 7 — a stretch of three half steps, an augmented 2nd, that sounds lurching and “exotic” when you try to sing or play through it melodically. Melodic minor fixes that by also raising the 6th, closing the gap into an ordinary run of whole steps while keeping the leading tone intact. The result reads as a hybrid: minor down at the bottom (flat 3rd), major up at the top (natural 6th and 7th).

Spelling formula (scale degrees): 1–2–♭3–4–5–6–7
Interval pattern: W–H–W–W–W–W–H
C melodic minor: C–D–E♭–F–G–A–B
A melodic minor: A–B–C–D–E–F♯–G♯

C melodic minor: a major scale with one note changed — the ♭3 — leaving an unbroken run of whole steps from 3 up to the leading tone

The classical rule jazz throws out

Classical theory only raises the 6th and 7th going up; coming back down it reverts to plain natural minor (♭7, ♭6), because the raised tones were only ever there to smooth an ascending melodic line toward the tonic. Jazz players ditch that asymmetry entirely and use the same raised form in both directions, which is exactly why this scale is nicknamed “jazz minor.” Treating it as one fixed, symmetrical scale rather than a directional ornament is what lets it function as a genuine harmonic source — a set of chord-scale material — rather than just a voice-leading trick.

The chord it implies, and where it actually works

Stack the scale in thirds from the root and you get the tonic sound of melodic minor harmony:

CmMaj7 = C – E♭ – G – B (minor-major seventh)

That major 7th is the whole point — and also the catch. Over a plain minor 7th chord (which wants a ♭7), the scale’s natural 7th clashes badly against the chord tone; melodic minor belongs on mMaj7 chords, on minor 6th chords (Cm6 = C–E♭–G–A), and on the modern minor-chord-scale situations built from its own modes — not as a generic substitute anytime you see “m7” on a chart. See Minor Key Harmony for how this sits alongside natural and harmonic minor as one of three competing minor-scale choices.

A scale that’s really seven scales

Because melodic minor has no avoid notes against its own harmony, every mode built from it is usable, and three in particular are jazz workhorses (full detail lives in their own notes):

4th mode → Lydian Dominant: lydian with a ♭7, the default sound over dominant chords carrying a ♯11
7th mode → The Altered Scale (super locrian): every dominant alteration at once — ♭9, ♯9, ♯11, ♭13 — the classic V7alt palette
6th mode → Locrian Natural 2: locrian with a natural 2nd instead of ♭2, a smoother-sounding option for half-diminished ii chords

These modal relationships, along with concrete voicings and progressions, are covered in Melodic Minor Applications.

♫ Listen

Miles Davis — “Solar” (Walkin’, 1954): the tune opens squarely on a Cm(maj7) sound — the tonic chord of C melodic minor. Listen to the head’s first bars for the bright-dark rub of a major 7th sitting on top of a minor triad.
Chet Baker — “My Funny Valentine” (Chet Baker Sings, 1954): the accompaniment under the opening phrase descends Cm–Cm(maj7)–Cm7–Cm6, passing straight through melodic minor’s raised 7th and 6th — the classic minor line cliché.