The three minors · From Zero to Mozart

Minor comes in three forms. They all share one key signature — they differ only in how the 6th and 7th degrees behave near the top of the scale. Here's why there are three, using E minor (one sharp, F♯) throughout.

The problem natural minor has

Play E natural minor up and stop on the 7th degree, D:

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E natural minor. The 7th degree, D, is a whole step below the tonic E. Stop on it: it doesn't ache to move the way F♯ does at the top of G major. It's a subtonic, not a leading tone.

That whole step means natural minor has no leading tone — no strong pull home. Composers fix it by raising the 7th.

Harmonic minor — raise the 7th

Raise D to D♯, a half step below the tonic. Now there's a real leading tone, and the chord built on the 5th degree becomes major and strong (that's the "harmonic" part — it's about the chords).

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E harmonic minor: D raised to D♯. Now the last step D♯→E leans in, hard. But listen to the gap between C (^6) and D♯ (^7) — three half steps, an 'augmented second'. That wide, jumpy step is harmonic minor's fingerprint: you hear it in Bach, in flamenco, in klezmer.

Melodic minor — raise the 6th too, going up

The augmented 2nd sounds fine in a chord, but jumpy in a running melody. So when the line is ascending, raise the 6th as well (C → C♯) to smooth it out. Coming down, there's nothing to smooth — no pull toward the tonic — so it reverts to plain natural minor.

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E melodic minor, going up: both C and D raised (C♯, D♯) for a smooth climb to the tonic. No jumpy augmented 2nd now.

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E melodic minor, coming down: C and D revert to natural — plain natural minor. Coming down there's no tonic to lean toward, so nothing needs smoothing. The two A-string notes (C, D) swap places between the ascent and the descent — the classic 'why is my C♯ suddenly natural' moment.

Hear the difference

Try

On the A string: play C (low 2), then D (3rd), then E (open) — the top of natural minor, smooth and mild. Now play C (low 2), then D♯ (3rd finger stretched forward), then E — the top of harmonic minor. Feel the stretch, hear the leap, then hear how hard that D♯ pulls up to E. That leap is the price of the leading tone.

The usual mistake

Trying to memorise all three forms in all twelve keys — the source book warns against exactly this, and it's right. Learn the idea: one key signature, and the 6th/7th get raised or not depending on whether you need a leading tone (harmonic) or a smooth melodic line (melodic). Then drill the specific minor keys your pieces are actually in. For this stage, that's E minor.