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The approach to get minor scales is the same, with the difference that the distances between the tones are different. Earlier we saw:
Distances in major scale: W-W-H-W-W-W-H.
Distances in minor scale: W-H-W-W-H-W-W.
We'll look at the scale of D minor.
The root tones starting at D:

The distances:

We want the distances to be W-H-W-W-H-W-W, so these are the ones that should be corrected:

The solution is to lower the B to B flat (Bb):

One more: the scale of C minor
The root tones starting at C:

The distcances:

We want the distances to be W-H-W-W-H-W-W, so these are the ones that should be corrected:

The solution: lower the E (Eb), lower the A (Ab) and lower the B (Bb).
