204 - No Content - P Diddy - A rapper who has somehow gained fame yet has no real creative output

202 - Accepted - Jay Z - Guessing a reference to him always talking about graduating from the School of Hard Knocks?

200 - OK - L'il Jon - His most popular guttural exclamation from his song of the same name

304 - Not modified - Dre - You may have forgotten about him, but he's still Dre

402 - Payment Required - 50 Cent - He is one looking to Get Rich or Die Tryin'

404 - Not Found - Sisqo - He introduced us to the Thong Song, but then has been nowhere to be found in over a decade

413 - Request Entity too large - Rick Ross - The man is just so damn big

(not sure if the songs are directly connected to the reference as in the case of Sisqo or Rick Ross, but more to the rapper?)