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Soul singer Leon Bridges' music is often ­likened to that of Otis Redding and Sam Cooke​ -- and his penchant for mid-century fashion would have blended right in on their album covers, too. "For inspiration, I go online and search 'Chicago 1950s' or 'New York 1950s.' I love how back then wearing a suit was the norm and the way they dressed was clean and it fit," says Bridges, 26. "Especially compared to skinny jeans."

Musicians love to drop weight fast, sometimes by any means necessary. So Billboard asked David Allen of David Allen Nutrition in Woodland Hills, Calif., who has worked with Zac Efron and Janet Jackson, to weigh in on some current (and crazy) diets.