Extra credit: Hits get added writers as lawsuits loom

In this June 30, 2013 file photo, Pharrell Williams, left, and Robin Thicke perform onstage at the BET Awards at the Nokia Theatre in Los Angeles. More and more, contemporary artists are giving credit to past songs in the wake of the infamous “Blurred Lines” case, where Thicke and Williams were ordered to pay $5.3 million to Marvin Gaye’s children in a copyright dispute.