Your book and DVD teach how to play guitar chord progressions based on the major scale, but what about chord progressions based on minor scales?
Once you learn how to build chords from the major scale and play the major/minor chord sequence by numbers you actually have the minor scale down too (and all the other modes). A chord progression can revolve around any scale degree. In other words, any number in the chord pattern can be home base. The natural minor scale is based on the sixth scale degree and chord. So for example, Am, Dm and Em would be a vi, ii, iii (6, 2, 3 all minor) chord progression based on the C major scale. You hear this in the song "Maria, Maria" by Santana. Since the Am is functioning as the root you really should call this the A minor scale (or A Aeolian mode) rather than C major but they are the same notes and chords either way. Some musicians like to renumber the chords and always refer to the root as chord number one. If you counted out the C major scale chords STARTING WITH A MINOR, then the "Maria, Maria" progression becomes i, iv, v (1, 4, 5 all minor). Reworking everything like this can be confusing and can make learning music theory a real burden. Fortunately, you don't have to do it. You can keep the numbers, and the guitar fretboard pattern, the same regardless of which chord a song starts on.
