Somalia-raised, Toronto-based rapper K'naan thinks like Bob Marley, flows like Eminem and mixes African music with conscious hip-hop, unabashed pop and even metal. The results are usually catchy and interesting: On "ABC's," K'naan contrasts North American gangster fantasies with his war-torn childhood, trading verses with old-school MC Chubb Rock, and then rocks out with Metallica guitarist Kirk...