Mary J. Blige to pen song for Sundance documentary (AP)

Mary J. Blige arrives at the 69th Annual Golden Globe Awards Sunday, Jan. 15, 2012, in Los Angeles. (AP Photo/Matt Sayles)AP – Mary J. Blige is lending her support — and her voice — to a documentary showing at the Sundance Film Festival about sexual assault in the U.S. military.

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