FILE - In a Sunday, April 1, 2012 file photo, singer Chaka Khan joins a rally of support for the family of Trayvon Martin as thousands gather in downtown Miami, demanding justice for Martin. New York's Appollo Theater confirmed Friday, May 18, 2012 that Grammy-award winning singer Khan will perform a tribute to the late Whitney Houston at the Apollo Theater's gala and awards ceremony. Lionel Richie and the late Etta James will be inducted into the theater's hall of fame during the June 4 gala. (AP Photo/J Pat Carter, File)
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