Viral Metal Grandpa Will Join Drowning Pool In Chicago

Back in June, an 82-year-old man named John Hetlinger stunned the world when he serenaded the America's Got Talent judges with an impassioned rendition of Drowning Pool's hit "Bodies." Apparently Drowning Pool was also impressed because they've invited Hetlinger to perform with them this Friday at Chicago's Open Air Music Festival. It seems very unfair…