4:30 p.m.: Not much need for brain cells when barechested Dizzee Rascal goes to work. He aims straight for the hips with his hard-grinding U.K. “grime,” a brand of hip-hop that combines arcade-game beats and Jamaican dancehall attitude. It’s libido-saturated fun, exemplified by the closing “Dance Wiv Me,” which is topping the British singles chart.