Classic inspirational and incredibly inventive old skool rap LP from Schoolly D. He did the artwork himself you know. Schoolly is at http://www.myspace.com/officialschoollyd.
In the modern era the excellent Edan was inspired by the Schooly D rap ethic. His Sprain Your Tapedeck LP is a classy nod to the master. Edan info can be found under a pseudonym at http://www.humblemagnificent.com.