Concrete Heat examines the illegal, underground, alternative music industry of mix tapes. A culture that spawned the likes of 50 Cent, Cam'ron and DMX and is fast making its way to the UK with big name labels falling over themselves to get in on the act.

Featuring figures from both the US and UK scenes such as Cam'ron, Chuck D, Semtex, and Estelle, Rodney P and Skitz lay it down mix tape style, taking you direct to the street, the breeding ground of the future of hip hop Listen to the documentary at BBC1