The musician took his own turn popping up during another artist's performance when he joined Backstreet Boys for "I Want It That Way" later that night

Luke Combs threw a whole lot of exciting curveballs during his headlining Stagecoach set on Sunday (April 27), and one of them was an appearance from pop-punk rockers Good Charlotte. The band's Benji and Joel Madden hopped onstage with Combs to perform "The Anthem," a 2003 mega-hit off their first studio album.