If you caught Cowboy Mouth at the 2015 Jazz Fest, you saw one of the best moments of Fred LeBlanc’s life. With the band preceding Jimmy Buffett at the Acura Stage—and thus playing to one of the largest crowds that Fest can hold—LeBlanc brought his five-year-old son Bash (Sebastian) onstage to hit some drums during the finale. You’ve seldom seen a dad grinning more proudly, and you’ve never seen a rock ’n’ roll wild man look more like an old softie.