Melodic Minor

Two versions of the same name

In classical writing the scale exists to solve a melodic problem. Harmonic minor has an awkward three-semitone step between its sixth and seventh degrees, so composers raised the sixth as well when a line ascended towards the tonic, and dropped both back to natural minor on the way down. The scale is therefore descriptive of a voice leading habit, not a fixed set of notes.

Jazz took the ascending form and used it in both directions. That single decision turns it into a genuine scale with its own harmony: one note away from major, one note away from harmonic minor, and containing intervals that appear in no other seven-note set. Every reference to the melodic minor in a jazz context means this version, and mixing the two definitions is the most common source of confusion around it.

The altered scale, and why the family matters

The seventh mode of melodic minor is the altered scale, also called super-locrian, and it is searched for more often than the parent scale in several languages. Over a dominant chord it supplies every altered tension at once — flat nine, sharp nine, sharp eleven and flat thirteen — which is why it became the default choice for a V chord resolving in a minor key.

The practical shortcut is worth memorising: to play altered over a dominant chord, play the melodic minor scale a semitone above its root. Over G7, that is A flat melodic minor. Nothing about the fingering is new; the whole technique consists of knowing which parent scale to reach for and hearing where it resolves.

Lydian dominant and the rest of the modes

The fourth mode, lydian dominant, is the second workhorse of the family. It is a dominant chord with a raised fourth and a natural thirteenth, the sound of a dominant that does not want to resolve, and it fits both tritone substitutions and the static dominant vamps common in modal jazz and in film music.

The remaining modes — dorian flat two, lydian augmented, mixolydian flat six and locrian natural two — are used more selectively. Locrian natural two deserves a mention: it works over a half-diminished chord and sounds considerably less bleak than plain locrian, because the second degree is no longer a semitone above the root.

How it is actually used

Melodic minor rarely functions as a key in the way major and minor do. It is applied chord by chord: altered over a dominant, lydian dominant over an unresolved dominant, the parent scale itself over a minor major seventh chord. Trying to write a whole piece in it usually produces something that sounds like an exercise, because the scale has no strong cadence of its own.

That makes it the first scale where knowing chord function matters more than knowing shapes. If you cannot tell whether the dominant in front of you resolves, you cannot choose between the altered scale and lydian dominant, and both are available from the same parent. Ear training on that one question does more for improvisation than another week of running patterns.

How to practise it

Start from what you already know rather than from the scale. Play a major scale and lower only the third — that is melodic minor. Then play harmonic minor and raise only the sixth; same result, different route. Two of these comparisons in a single session teach the sound faster than reading the interval formula.

After that, practise it as an answer to a chord rather than as a scale. Loop a G7 and play A flat melodic minor over it, then loop a G7 that resolves to C major and hear how much tension the same notes create. On guitar the shape moves like any other; the difficulty is entirely in choosing the right parent at the right moment.

Frequently asked questions