Music Tip #6. If you want to change a Major Chord into its Relative Minor, just add the sixth note directly above the fifth. For example, the notes for a C Major chord are CEG. If you add the next note after G, which is an A, you get CEGA, which is A Minor 7, the relative minor of C Major.
All of the accompaniment on the second clip is written with the sixth note added, giving it a real minor feel. Some of it works, some of it not so much.
The Write Stuff 