This is just about as good of a freestyle as you are EVER going to here. And it was done in 92, Black Thought kills it.
Supernatural imo is the greatest freestyler ever but this is nice. Hip hop must see imo.

[youtube=425,350]03ybqP7G6Po[/youtube]

http://www.youtube.com/watch?v=03ybqP7G6Po