The Three Minor Scales and Why They Exist

The idea

Minor is not one scale. It is one tonality with three versions, each solving a specific problem.

Scale	Formula	A minor	Why it exists
Natural minor (Aeolian)	1 2 ♭3 4 5 ♭6 ♭7	A B C D E F G	The default rock and metal minor
Harmonic minor	1 2 ♭3 4 5 ♭6 7	A B C D E F G♯	Gives the key a leading tone and a strong V chord
Melodic minor	1 2 ♭3 4 5 6 7	A B C D E F♯ G♯	Smooths out the gap in harmonic minor

Natural minor is the default. Its weakness is the ♭7 (G in A minor): it sits a whole step below the tonic, so there is no leading tone and the pull home is soft.

Harmonic minor raises the 7th. That gives minor keys a real dominant chord: E major instead of E minor, and a strong V–i cadence. The price is the gap between ♭6 and 7 (F to G♯), an augmented 2nd. That gap is the exotic “neoclassical” or “Middle Eastern” sound. It is Yngwie Malmsteen’s home scale and it is all over metal.

Melodic minor raises the 6th as well, which removes the gap for smooth melodies. In classical practice it goes up with the raised notes and comes down as natural minor. In jazz and modern usage it is the same in both directions.

Compare the three. Switch between them and watch which notes move:

The practical rule for rock, pop and metal: think in natural minor by default, and raise the 7th only in the moment where you want a strong pull to the tonic, which usually means over the V chord. You do not choose one scale for the song. You inflect notes for the moment.

On your instrument

• The relative-key shortcut. Every natural minor scale is the major scale starting from its 6th degree. A minor uses the same notes and the same patterns as C major, but the root is A, and hearing A as home changes everything. Turn on the drone on A in the explorer above and play your familiar C major patterns. Feel the center shift.
• Derive, do not memorize. Take one natural minor position in A. Find every G in it and raise it one fret to G♯. That is harmonic minor in the same position.
• Piano. Play A natural, harmonic and melodic minor, one octave each. Say out loud which degree changed as you play it.

Worked example

A melody over Am – Dm – E – Am that raises the 7th only where the harmony needs it. One bar per chord, 8th notes:

Chord	Notes played	What is happening
Am	C A G F E	Pure natural minor. The G is the ♭7.
Dm	D E F E D F	Still natural minor, landing on F, the 3rd of Dm.
E	B G♯ E F E G♯	The G becomes G♯, the 3rd of the E major chord. F to G♯ is the harmonic minor gap.
Am	A	G♯ resolves up a half step to the tonic.

Play the progression here, then improvise over it with the same idea:

Exercises

1. Loop Am – Dm – E – Am with the player above. Improvise using A natural minor everywhere except over the E chord. There, play G♯ instead of G. Hear how the G♯ lights up the pull home.
2. Write two 4-bar melodies over an A drone: one strictly natural minor, one harmonic minor that features the F to G♯ leap. Label the mood of each in one word.
3. Find the harmonic minor sound in the wild: listen to a neoclassical metal solo or a flamenco piece and catch the moment where the raised 7th appears.

Common mistakes

• Playing harmonic minor over the whole song. The raised 7th clashes with chords that contain the ♭7, such as ♭VII and ♭III (G and C in A minor).
• Thinking of A minor as “C major starting on A”. The notes are the same, but the tonic is not. Practice with a drone until A sounds like home.

Check yourself