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6.6.4 7 Chords: I, IIm, IIIm, IV, V, VI, VIIº
To construct a harmonic scale (scale of chords), here are the 7 chords to start with, the basic chords for any given key (in modified Nashville Number notation):
I IIm IIIm IV V VIm VIIº
The next step is to arrange these chords with each chord the smallest distance apart harmonically (just as, in a melodic scale, the notes are the smallest distance apart as you go up or down the scale stepwise, from note to note). That means the root of each chord would be a fifth apart, since, in harmony, a fifth progression is the smallest harmonic distance.