At the beginning of his "Wagon Wheel" performance at the 2015 iHeartRadio Country Festival, Darius Rucker urged fans to sing along if they knew the words -- and clearly, they obliged.

"Come on boys, come on!" Rucker yelled as he and the band got into the groove.

The crowd instantly recognized the song as Rucker introduced it; after all, he won a Grammy for his rendition of the Old Crow Medicine Show tune, and it was a radio smash.

"So, rock me, mama, like a wagon wheel / Rock me, mama, any way you feel / Hey, mama, rock me," the crowd sang.

Like many of the other performers at the festival, Rucker headed off stage and into the crowd during his set, and it was there, surrounded by fans, that he led a gigantic sing-a-long, letting the fans closest to him sing with him into the mic. Rucker also gave them high fives before trucking through the sea of fans back toward the stage.

But, Rucker wasn't done yet: He stopped at yet another group and gave them a chance to shine before singing the chorus one last time.

Rucker's performance was one of many that aired on NBC on Wednesday (May 27), after the 2015 iHeartRadio Country Festival took place in Austin, Texas, at the beginning of May.

The 49-year-old recently released a new single, "Southern Style," the title track of his new record. The album was released on March 31, and his Southern Style Tour kicked off on May 14. Brett Eldredge, the Brothers Osborne and A Thousand Horses are the openers on the trek.

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