The enigmatic, frighteningly talented young Compton rapper Kendrick Lamar, who has been absolutely wrecking shit lately, gave us an entirely context-free new song yesterday, and it's a good one. "Cartoon & Cereal" is a weird seven-minute polysyllabic vamp, and Kendrick is one of the few who can pull off a track like that without making it sound overly pretentious. And ...