Madonna released some classic albums during the course of her 30+ years as a recording artist, but if you have to nail down the one album that truly defined her sound and helped her make the jump from pop singer to superstar, it’s LIKE A VIRGIN. With iconic videos of the last two songs in heavy rotation on MTV, the set soared to #1 on the U.S. chart, becoming the first solo album by a female artist to sell more than 5 million copies on this day in 1985. By the time the album had run its course,