Mos Def to play Chuck Berry in Cadillac Records.

US rapper and actor Mos Def is to play Chuck Berry in a new film about the legendary record label Chess Records. Cadillac Records, written and directed by Darnell Martin, is set in the 1950s and will follow the lives of Leonard Chess, the man who founded Chess Records, and some of its famous artists. This is the same movie Beyonce plays Etta James in.