The country star also debuted a new song with Bailey Zimmerman called "Backup Plan," and later showed up as the Backstreet Boys' guest Luke Combs had a few surprises up his sleeve for his headlining set at Stagecoach.

Stagecoach Festival headlining set by Luke Combs featured a Garth Brooks encore, alongside appearances by Good Charlotte, Bailey Zimmerman.

Combs keyed up expectations as he told fans something special was on the way to help him close out an already-rousing festival set. Playing somewhat coy, he sang the first portion of "Friends in Low Places," only for Brooks to quietly appear on stage and take over.