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    Usher performs at the "A Decade of Difference" concert on October 15, 2011, at the Hollywood Bowl, Los Angeles.

    (Photo by Stephanie Cabral/Yahoo!)

    Watch Usher's entire performance

    Usher performs at Decade of Difference concert

    Usher performs at A Decade of Difference: A Concert Celebrating 10 Years of the William J. Clinton Foundation on October 15, 2011, at the Hollywood Bowl, Los Angeles.