Guest List: Mary J. Blige Hip-Hop Collaborations

Sometimes a rapper needs a singer to bring home the emotional core of a song, and no one delivers raw feeling quite like Mary J. Blige. That scorching, mercurial voice may be furious, vulnerable or entirely overwhelmed, but it always has an edge of street toughness. All the rapper has to do—and Mary has worked with the best—is keep the flow going and try to keep up.