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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)

A Decade of Difference concert

Performances from "A Decade of Difference: A Concert Celebrating 10 Years of the William J. Clinton Foundation" on October 15, 2011, in Hollywood, California. Performers include Stevie Wonder, Lady Gaga, Usher, The Edge, Bono, K'naan, Kenny Chesney and Juanes.