1. This Week in Billboard Chart History: In 1979, Blondie's 'Heart of Glass' Hit No. 1

    April 27, 2015 8:05 AM EDT Thirty-six years ago, the rockers reigned on their first try. Plus, remembering chart feats by Rascal Flatts, Michael Jackson and Alicia Keys. Your weekly recap celebrating significant milestones from more than seven decades of Billboard chart history. April 27, 1963 Little Peggy March began…