Billy Joel has sold more records than The Stones, Bruce Springsteen, and Madonna—though the “rock star thing” is something he can “take off.” Joel started playing piano when he was about four or five years old, but he admits that he doesn't remember how to read sheet music anymore. He says it’d be like reading Chinese. That doesn't stop the third best-selling solo artist of all time in the U.S. from plunking out a few tunes with Alec.