There are a number of different minor scales available, suiting different situations and chord progressions. Two of the most common used by guitarists are the minor pentatonic (1-b3-4-5-b7 ...

Of course, not all triads have to be chords of C major or minor. You can use the process, of selecting the 1st (root), 3rd, ...

The characteristics of these minor scales mean that triads based on these degrees of the scale make different kinds of chords. These chromatic alterations have been the basis of a whole range of ...