After attending a performance he dubbed "the best show [he's] ever seen in his life," Clement walked on stage to join cast members Eddie Clendening as Elvis Presley, Lance Guest as Johnny Cash, Jared Mason as Jerry Lee Lewis and Erik Hayden as Carl Perkins.
Cowboy Jack Clement served as the engineer for the infamous 1956 Sun Records recording session that united Johnny Cash, Elvis Presley, Jerry Lee Lewis and Carl Perkins.
To watch the encore performance, look below: