Good job. I like those yells that are put in, I think they fit nicely where they are. Drums sounds great, beat is awesome. It loops perfectly too!
Intro was a little long without much happening. Maybe for rap it's supposed to be that way, I don't know. But, I think you could have had another instrument in the intro. Also, I would have liked to see more variety over-all.
Not much to say about this. Great beat, just seems a little empty to me at some parts.
P.S. Using Newgrounds as external storage...interesting...