The Jason Mraz of adolescent England continues his climb up Mt. Fame. After opening for Taylor Swift, he now headlines his own arena tour with his overearnest puppy dog rap-folk. Can a ginger-scented body spray be far behind? The 23-year-old is flying high off Pharrell-produced single "Sing," which explores the godforsaken scorched earth between LFO's "Summer Girls" and the Doobie Brothers' "Long Train Runnin'." Wait, tickets are how much?