Let's not forget "Don't Sweat the Technique" by Eric B and Rakim, a tune often played at jams by old school lovers.
As for rocking fast beats, i'm sure someone has mentioned it, but the only secret to rocking sick beats at 120 beats per second

is to practice alot.
I've been rocking to all diff beats for a while now and it's starting to pay off, i can rock any beat nicely nowadays.
Peace