FILE - This May 7, 2012 file photo shows Beyonce Knowles at 

FILE - This May 7, 2012 file photo shows Beyonce Knowles at the Metropolitan Museum of Art Costume Institute gala benefit, celebrating Elsa Schiaparelli and Miuccia Prada in New York. Beyonce called for a moment of silence for Trayvon Martin during a concert just hours after George Zimmerman was found not guilty by a Florida jury, Saturday, July 13, 2013 in Nashville, Tenn. (AP Photo/Evan Agostini, File)
Associated Press
FILE - This May 7, 2012 file photo shows Beyonce Knowles at the Metropolitan Museum of Art Costume Institute gala benefit, celebrating Elsa Schiaparelli and Miuccia Prada in New York. Beyonce called for a moment of silence for Trayvon Martin during a concert just hours after George Zimmerman was found not guilty by a Florida jury, Saturday, July 13, 2013 in Nashville, Tenn. (AP Photo/Evan Agostini, File)
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