The play-alongs have been very popular, so here is one that is nice and simple and will let you go ridiculoso all over A minor. (UPDATE: Now there are two. Both A min. What the hell. Why not.)
It's just that one chord, A minor with a gee-tar, a synth and drums, and it will loop until you can't take it anymore and make it stop. So drop it in your favorite loop-able audio player of choice and commence to A minor-ing.
Slap away over it or do some fingerstyle funk or do some one-chord-vamp soloing. Go nuts.
A minor, for the whole thing.