Harmonic and Melodic Minor Scales
Here you'll learn how to change one or two notes of the minor scale to get the harmonic minor, tense and Middle Eastern in flavor, and the melodic minor, which moves more smoothly, and then how to choose between them in a melody.
The minor scale you know, the white keys from A to A, is more precisely called the natural minor. It sounds dark and gentle at the same time. But it's missing something the major scale has: a note that really pulls toward home. In this lesson, we're going to give it one, and along the way you'll discover a very recognizable color of dark trap and drill.
The note that pulls toward home
Remember the end of the major scale: the seventh note is only a half step below the tonic, and it makes you want to go up to it. This note is called the leading tone (the leading note, in British usage), because it leads into the tonic. In the natural minor, the seventh note is a whole step below the tonic: in A minor, it's G, two rows below A. Listen to the difference between these two little turns around the tonic.
With G, the return to A is calm, almost indifferent. With G♯, the middle note hugs the tonic and the return sounds like a real resolution. To get this effect in minor, musicians got into the habit of raising the seventh note of the scale by a half step.
The harmonic minor
Making that one change gives you the harmonic minor. In A, its notes are A, B, C, D, E, F and G♯. Everything else from the natural minor stays, in particular the third note, C, which keeps the dark color, and the sixth, F.
Now count the half steps between F and G♯. There are three: F to F♯, F♯ to G, then G to G♯. That's a gap of a step and a half, wider than any other step in the scale, and it's called an augmented second. So the complete pattern becomes: whole, half, whole, whole, half, step and a half, half. It's that big step that gives the harmonic minor its very particular color, which many listeners describe as Middle Eastern, dramatic or unsettling.
Listen to a phrase built on this scale. It makes you hear the jump from F to G♯, then it comes back toward the tonic through the leading tone.
You heard it: that three-half-step jump is enough to change the mood. Played on a pluck, a bell or a plucked-string sound, with a dark bass underneath, it instantly suggests a film atmosphere or a Middle Eastern color, even if the music has nothing traditional about it.
What the leading tone changes in the chords
The harmonic minor gets its name because it comes from the chords, from harmony. In A natural minor, the chord built on the fifth degree is E minor: E, G, B. Listen to a loop that uses it before coming back to A minor.
Now change just one note in the third chord: G becomes G♯. The chord becomes E major, E, G♯, B, and its middle note is precisely the leading tone.
With E major, the return to A minor sounds much more decisive, almost classical. It's a choice of color: the natural version stays more floating, the harmonic version more dramatic. We'll come back to this pull in the lesson on tension and resolution.
The melodic minor, for a smooth climb
The augmented second has a downside: in a melody that climbs gently, that big jump from F to G♯ draws attention, and that's not always what you want. To keep the leading tone without the jump, you raise the sixth note too. That gives you the melodic minor: A, B, C, D, E, F♯ and G♯.
Notice that only the third note still sets it apart from A major: the start of the scale is dark, the end is bright. In classical tradition, it's used this way only going up. Coming back down, you return to the natural minor, with G and F, since the leading tone has no reason to be there once you're moving away from the tonic. Listen to this classical version, which goes up in melodic minor and comes down in natural minor.
In jazz and in a lot of today's music, the melodic form is often kept in both directions, as a scale in its own right. Both uses exist; what matters is that you hear what each note brings.
Which one to choose in a melody
In practice, you won't pick just one of these scales for a whole track. You'll almost always start from the natural minor, and add the leading tone in certain places: when the melody heads back to the tonic, or when the chord on the fifth degree is major. If the melody moves from the sixth to the seventh note, you'll have a choice between the Middle Eastern jump of the harmonic minor and the smoother path of the melodic minor.
| Scale | Notes in A | What changes | Color |
|---|---|---|---|
| Natural minor | A B C D E F G | nothing | dark, gentle |
| Harmonic minor | A B C D E F G♯ | raised 7th degree | tense, Middle Eastern |
| Melodic minor | A B C D E F♯ G♯ | raised 6th and 7th degrees | dark, then bright |
To hear the three scales one after the other on the same tonic, and to try them on other starting notes, use the next tool.
Note to note: whole step, half step, whole step, whole step, half step, step and a half, half step.
Characteristic note: the major seventh, or leading tone, G♯. It pulls toward the tonic and, with the sixth, creates a leap of three half steps: that is the Middle Eastern color you hear in drill and dark trap.
On the grid, the shaded rows are the notes of the scale across an octave and a half: any note you place on those rows stays in the scale. The pattern drawn goes up one octave, then comes back down.
Here's a two-bar phrase in D natural minor, over a bass on D. Change just one note to bring in the leading tone right before the final note, then say which scale you end up with.
These variants change only one or two notes of the minor scale. The next lesson goes further and introduces the modes, other ways to color a scale by moving a single note.