dont listen to past tense, he history.

You simply need a ear for music bro, if you dont have it then try to pick it up quick. Listen for beat change ups and tempo switches. I feel gay for saying this, but when learning to use a beat, you will most proberly find a lill jon beat easiest, simply cause they are so wack they consist of the same bass line thru out the enitre thing, except maybe intro and outro.

Or, you could stay old school and just accapella rap.