'Rebel Heart': Madonna Reveals the Story Behind Six Surprise Songs

For the past year, Madonna has been updating fans on the progress of her 13th studio album through Instagram posts picturing collaborators (Nicki Minaj, Avicii, Diplo) and inspirations (children in Malawi, Miley Cyrus, placards reading "I need more money and power and less shit from you people"). But last week her creative......