What is the name of this song?

You can hear the song here: http://www.youtube.com/watch?v=2E5uIAxFp-4&feature=player_embedded

It's the scene right before Chris quits his job. He pulls over to black guys and calls for backup (but gets none). The two black guys are sitting in their car, listening to a certain rap song.

What is the name of the song, or the artist(s) who made it?

Thanks in advance.