Behind many famous singers sit the "hired guns" who make them shine. You don't always know their names, but they've helped create the songs you know and love. Liberty DeVitto sat behind the drums for Billy Joel for 30 years, both on the road and in the studio. He shares his stories in the new documentary "Hired Gun" which is out now. Calling in from his home in Brooklyn, we ask him about his favorite drummers, who'd win in a drum off, and his memories from playing in the former Soviet Union, where rock music was banned.