so far the ones on the wiki page are the ones really on there dunno if its the whole list like someone said before
* Styles P - "What's the Problem"
* Uncle Murda - "Anybody Can Get It"
* Qadir - "Nickname"
* Busta Rhymes - "Where's My Money"
* Maino - "Getaway Driver"
* Red Cafe - "Stick'm"
* Tru-Life - "Wet 'em Up"
* Johnny Polygon - "Price On Your Head"
* Swizz Beatz - "Top Down"
* Nas - "War Is Necessary"
* Kanye West featuring Dwele - "Flashing Lights"
* Joell Ortiz featuring Jadakiss & Saigon - "Hip Hop (Remix)"
* Fat Joe featuring Lil Wayne - "Crackhouse"
* Mobb Deep featuring Havoc & Prodigy - "Dirty New Yorker"
* Ghostface Killah featuring Kid Capri - "We Celebrate"
* Styles P featuring Sheek Louch & Jadakiss - "Blow Your Mind (Remix)"
* Papoose - "Stylin'"
there's also some old skool hip hop too
http://en.wikipedia.org/wiki/Grand_Theft_Auto_IV_soundtrack#Beat_102.7