Extreme played earlier in the day and stuck around to watch Aerosmith's headlining set from sidestage, when Tyler wandered over and had them join in on the song.

"That was the ultimate Aerosmith experience," said drummer Kevin Figueiredo after the show. The Hellfest show was one stop on Aerosmith's Let Rock Rule European tour, which will wrap up at the Heineken Festival in CVenice, Italy on July 3.