Billy Joel attended the Dania Beach Vintage Motorcycle Show on January 28th, where he thrilled the crowd when he got up and sang with a local band, The Whipping Post. Event organizer Clare Frost said, "He walked through the crowd without people really knowing who he was and looked at the over 230 vintage bikes on display and talked to a few of our vendors and out of the blue, he walks up on stage and stood there facing the lead singer, Bob. Bob did a double take and Billy asked him if he could jam with them."
Here's a fan video of that impromptu performance. Read more at The Miami Herald.