Teach Yourself Music Theory – 13.) Pitch-Class Collections of Natural Minor Scales

Continuing with the idea of pitch-class collections and how they can form scales, let’s introduce a new scale: the natural minor scale.

To make a natural minor scale, one has to have a collection of pitches that in ascending order go in an intervallic pattern of whole-step, half-step, whole-step, whole-step, half-step, whole-step, and whole-step back to the original pitch. One can also think of this as M2-m2-M2-M2-m2-M2-M2.

Take a look at the composition below, write the pitch-class collection, and then arrange the pitches into an ascending manner fitting the pattern of the natural minor scale:

If you did it correctly, you would get {F#, G#, A, B, C#, D, E, F#}, which means this composition uses a F# minor scale…

…but wait, don’t the same pitches used also make up the A Major scale?

That is correct! For every major scale, there is its own relative natural minor scale. All you have to do is go down a minor-third interval (or up a major-sixth interval) from the original major scale to find the relative minor scale. So C major is A minor, G major is E minor, E major is C# minor, etc.

Now, how can well tell if a song is using a major or minor scale? well, that will be saved as a topic for next time.

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