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Expect appearances by Chelsea and Bill, as Hillary Clinton enlists a few top-tier pop stars to headline this campaign benefit concert. For younger fans, Katy Perry turns up eight years on from "I Kissed a Girl," having turned from novelty starlet to signature cotton-candy-fied pop princess. Hill-Dog supports of an older generation, on the other hand, can swoon along to "Tiny Dancer" with Sir Elton.