By the time the millennium flipped, Robbie Williams was a worldwide pop sensation, and to celebrate he decided to hit the dance floor. The genre-hopping Sing When You’re Winning shows him at his cheeky, bopping peak. “Rock DJ” is a funky, self-referential strut, while the Kylie Minogue duet “Kids” pairs slinky, innuendo-laden verses with an anthemic chorus. Williams’ arch persona gives the trippy “Let Love Be Your Energy” an extra kick, but he also brings plenty of gravitas to introspective offerings like "Love Calling Earth."