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Harry Belafonte performs; 'On Stage at the Kennedy Center: The Mark Twain Prize' will air November 21, at 9 p.m. on PBS. (Photo by KMazur/WireImage)

Harry Belafonte performs; 'On Stage at the Kennedy Center: The Mark Twain Prize' will air November 21, at 9 p.m. on PBS. (Photo by KMazur/WireImage)