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Stevie Wonder 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. (Photo by Handout/Getty Images for Control Room)

Stevie Wonder at Decade of Difference concert

Surprise guest Stevie Wonder 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.