Minor Scale Harmony
The minor scale has a few peculiarities. Although the minor scale has the same notes as the relative major scale/key signature it's derived from and should have the exact same resulting chords, in a different order, the minor scale has some quirks when it comes to harmony. Recall the harmonic minor scale, a minor scale with a raised seventh tone, from Chapter 4. The harmonic minor scale exists solely to correct the harmony of the minor scale and make it more useful. Look at the normal minor scale harmonized with triads in FIGURE 7.15.
FIGURE 7.15 All Triads in A Minor
By harmonizing the A natural minor scale, you get the same chords as you did in C major, just in a different order. There is nothing wrong with the natural minor scale. However, in tonal music, that minor scale is not harmonized, because it's lacking what is known as a proper dominant chord. Chapter 9 examines functional chord progressions to show you how the minor scale is actually used in practice.