I wouldnt know any
Never mind! I think I found my answer off a website I go to for things I don't understand. Check out the answer I got:
Here was my question to them.
Me: Anyone know any good books on parallel minor or modal interchange or mode mixture as they like to call it?
Website: You don't need a book, the principle can be explained in a few lines - as in fact I think I did above .
"Modal interchange" and "mode mixture" are two names for the same thing: the idea that you can use chords from any scale with the same tonic or keynote. That's what "parallel modes" or "parallel scales" means: same root note, different scale structure.
"Borrowing from the parallel minor" is just the name for the most common kind of modal interchange, where we start with a major key, and bring in chords from the minor key with the same keynote. (Chord from A minor can be used in the key of A major, alongside the usual A major chords.) This is especially common in rock music, but dates back centuries.
Eg, key of A major:
Diatonic chords: A Bm C#m D E F#m G#dim
Common borrowings from A minor: C (bIII), Dm (iv), F (bVI), G (bVII).
All you need to do now is take a handful of your favourite rock songs, look at the chord progressions, and see if you can spot borrowed chords.
