Kelsea Ballerini surprised one of her biggest fans recently when she showed up unannounced at Nashville’s Bluebird Cafe. Twelve-year-old Landon Wall was performing “Lost Boy” — his response to Kelsea’s hit “Peter Pan” — when she joined him on stage. Ballerini said, “I only think it’s fair that if you’re gonna sing the response, I get to sing mine too.”