Between the crackling grooves of her mom's dusty 45s and the static-stuffed transmissions of her local radio station, Mary learned all she needed to know about delivering soul music. Her first t …

Hip-Hop taught Mary J. that music is all about collaboration, and the pop icon/B-girl-at-heart is nothing if not a team player. When Method Man asked her to sing the hook for "I'll Be There for You/You …