Mike Hranica. lead singer of The Devil Wears Prada, plays to the crowd during Saturday's Rockstar Energy Drink Mayhem Festival at the First Midwest Bank Ampitheatre. | Curtis Lehmkuhl~Sun-Times Media

Metal fans ready for Devil Wears Prada, one of the bands playing the Rockstar Energy Drink Mayhem Festival at the First Midwest Bank Ampitheatre Saturday. | Curtis Lehmkuhl~Sun-Times Media

Mike Hranica of The Devil Wears Prada breaks into the first song during the Rockstar Energy Drink Mayhem Festival at the First Midwest Bank Ampitheatre Saturday. | Curtis Lehmkuhl~Sun-Times Media

Fans rock out to bands at the Rockstar Energy Drink Mayhem Festival at the First Midwest Bank Ampitheatre Saturday. | Curtis Lehmkuhl~Sun-Times Media

Crowdsurfing fans scream during the Rockstar Energy Drink Mayhem Festival at the First Midwest Bank Ampitheatre Saturday. | Curtis Lehmkuhl~Sun-Times Media

The Devil Wears Prada breaks into their opening song during the Rockstar Energy Drink Mayhem Festival at the First Midwest Bank Ampitheatre July 21. | Curtis Lehmkuhl~Sun-Times Media

The Devil Wears Prada rips into their set during the Rockstar Energy Drink Mayhem Festival at the First Midwest Bank Ampitheatre July 21. | Curtis Lehmkuhl~Sun-Times Media

The Devil Wears Prada breaks into their opening song during the Rockstar Energy Drink Mayhem Festival at the First Midwest Bank Ampitheatre July 21. | Curtis Lehmkuhl~Sun-Times Media

The Devil Wears Prada breaks into their opening song during the Rockstar Energy Drink Mayhem Festival at the First Midwest Bank Ampitheatre July 21. | Curtis Lehmkuhl~Sun-Times Media

The Devil Wears Prada rips into their set during the Rockstar Energy Drink Mayhem Festival at the First Midwest Bank Ampitheatre July 21. | Curtis Lehmkuhl~Sun-Times Media

The Devil Wears Prada rips into their set during the Rockstar Energy Drink Mayhem Festival at the First Midwest Bank Ampitheatre July 21. | Curtis Lehmkuhl~Sun-Times Media

The Devil Wears Prada rips into their set during the Rockstar Energy Drink Mayhem Festival at the First Midwest Bank Ampitheatre July 21. | Curtis Lehmkuhl~Sun-Times Media

The Devil Wears Prada rips into their set during the Rockstar Energy Drink Mayhem Festival at the First Midwest Bank Ampitheatre July 21. | Curtis Lehmkuhl~Sun-Times Media

Anthrax breaks into their song "Caught in a Mosh" at the Rockstar Energy Drink Mayhem Festival July 21 at the First Midwest Bank Ampitheatre. | Curtis Lehmkuhl~Sun-Times Media

Scott Ian of Anthrax bows to the crowd before their first song "Caught in a Mosh" at the Rockstar Energy Drink Mayhem Festival July 21 at the First Midwest Bank Ampitheatre. | Curtis Lehmkuhl~Sun-Times Media

Scott Ian of Anthrax bows to the crowd before their first song "Caught in a Mosh" at the Rockstar Energy Drink Mayhem Festival July 21 at the First Midwest Bank Ampitheatre. | Curtis Lehmkuhl~Sun-Times Media

Anthrax breaks into their song "Caught in a Mosh" at the Rockstar Energy Drink Mayhem Festival July 21 at the First Midwest Bank Ampitheatre. | Curtis Lehmkuhl~Sun-Times Media

Anthrax breaks into the second song of their set at the Rockstar Energy Drink Mayhem Festival Saturday at the First Midwest Bank Ampitheatre. | Curtis Lehmkuhl~Sun-Times Media

Joey Belladonna sings "Caught in a Mosh" at the Rockstar Energy Drink Mayhem Festival Saturday at the First Midwest Bank Ampitheatre. | Curtis Lehmkuhl~Sun-Times Media

Anthrax breaks into their song "Caught in a Mosh" at the Rockstar Energy Drink Mayhem Festival July 21 at the First Midwest Bank Ampitheatre. | Curtis Lehmkuhl~Sun-Times Media

The Devil Wears Prada rips into their set during the Rockstar Energy Drink Mayhem Festival at the First Midwest Bank Ampitheatre July 21. | Curtis Lehmkuhl~Sun-Times Media

Joey Belladonna of Anthrax gets the crowd going during the second song of their set at the Rockstar Energy Drink Mayhem Festival Saturday at the First Midwest Bank Ampitheatre. | Curtis Lehmkuhl~Sun-Times Media

Anthrax breaks into the second song of their set at the Rockstar Energy Drink Mayhem Festival July 21 at the First Midwest Bank Ampitheatre. | Curtis Lehmkuhl~Sun-Times Media

Fans show their support for Anthrax at the Rockstar Energy Drink Mayhem Festival July 21 at the First Midwest Bank Ampitheatre. | Curtis Lehmkuhl~Sun-Times Media

Anthrax perform at the Rockstar Energy Drink Mayhem Festival Saturday at the First Midwest Bank Ampitheatre. | Curtis Lehmkuhl~Sun-Times Media

Anthrax perform at the Rockstar Energy Drink Mayhem Festival July 21 at the First Midwest Bank Ampitheatre. | Curtis Lehmkuhl~Sun-Times Media

Joey Belladonna (left) and Scott Ian of Anthrax perform at the Rockstar Energy Drink Mayhem Festival July 21 at the First Midwest Bank Ampitheatre. | Curtis Lehmkuhl~Sun-Times Media

Lemmy Kilmister of Motorhead leads the band during their first song at the Rockstar Energy Drink Mayhem Festival July 21 at the First Midwest Bank Ampitheatre. | Curtis Lehmkuhl~Sun-Times Media

Lemmy Kilmister of Motorhead leads the band during their first song at the Rockstar Energy Drink Mayhem Festival July 21 at the First Midwest Bank Ampitheatre. | Curtis Lehmkuhl~Sun-Times Media

Lemmy Kilmister of Motorhead leads the band during their first song at the Rockstar Energy Drink Mayhem Festival July 21 at the First Midwest Bank Ampitheatre. | Curtis Lehmkuhl~Sun-Times Media

Lemmy Kilmister of Motorhead leads the band during their set at the Rockstar Energy Drink Mayhem Festival July 21 at the First Midwest Bank Ampitheatre. | Curtis Lehmkuhl~Sun-Times Media

Lemmy Kilmister of Motorhead leads the band during their set at the Rockstar Energy Drink Mayhem Festival July 21 at the First Midwest Bank Ampitheatre. | Curtis Lehmkuhl~Sun-Times Media

Motorhead busts into their set at the Rockstar Energy Drink Mayhem Festival July 21 at the First Midwest Bank Ampitheatre. | Curtis Lehmkuhl~Sun-Times Media

Motorhead busts into their set at the Rockstar Energy Drink Mayhem Festival July 21 at the First Midwest Bank Ampitheatre. | Curtis Lehmkuhl~Sun-Times Media

Motorhead busts into their set at the Rockstar Energy Drink Mayhem Festival July 21 at the First Midwest Bank Ampitheatre. | Curtis Lehmkuhl~Sun-Times Media

Motorhead busts into their set at the Rockstar Energy Drink Mayhem Festival July 21 at the First Midwest Bank Ampitheatre. | Curtis Lehmkuhl~Sun-Times Media

Lemmy Kilmister of Motorhead leads the band during their first song at the Rockstar Energy Drink Mayhem Festival July 21 at the First Midwest Bank Ampitheatre. | Curtis Lehmkuhl~Sun-Times Media

Kerry King of Slayer performs the first song of the band's set at the Rockstar Energy Drink Mayhem Festival July 21 at the First Midwest Bank Ampitheatre. | Curtis Lehmkuhl~Sun-Times Media

Kerry King of Slayer performs the first song of the band's set at the Rockstar Energy Drink Mayhem Festival July 21 at the First Midwest Bank Ampitheatre. | Curtis Lehmkuhl~Sun-Times Media

Dave Lombardo of Slayer performs during the band's set at the Rockstar Energy Drink Mayhem Festival July 21 at the First Midwest Bank Ampitheatre. | Curtis Lehmkuhl~Sun-Times Media

Kerry King of Slayer performs during the band's set at the Rockstar Energy Drink Mayhem Festival July 21 at the First Midwest Bank Ampitheatre. | Curtis Lehmkuhl~Sun-Times Media

Kerry King of Slayer performs during the band's set at the Rockstar Energy Drink Mayhem Festival July 21 at the First Midwest Bank Ampitheatre. | Curtis Lehmkuhl~Sun-Times Media

Tom Araya of Slayer performs during the band's set at the Rockstar Energy Drink Mayhem Festival July 21 at the First Midwest Bank Ampitheatre. | Curtis Lehmkuhl~Sun-Times Media

Tom Araya of Slayer performs during the band's set at the Rockstar Energy Drink Mayhem Festival July 21 at the First Midwest Bank Ampitheatre. | Curtis Lehmkuhl~Sun-Times Media

Kerry King (left) and Gary Holt of Slayer perform during the band's set at the Rockstar Energy Drink Mayhem Festival July 21 at the First Midwest Bank Ampitheatre. | Curtis Lehmkuhl~Sun-Times Media

Kerry King (left) and Gary Holt of Slayer perform during the band's set at the Rockstar Energy Drink Mayhem Festival July 21 at the First Midwest Bank Ampitheatre. | Curtis Lehmkuhl~Sun-Times Media

Tom Araya of Slayer performs during the band's set at the Rockstar Energy Drink Mayhem Festival July 21 at the First Midwest Bank Ampitheatre. | Curtis Lehmkuhl~Sun-Times Media

Slayer performs their set at the Rockstar Energy Drink Mayhem Festival July 21 at the First Midwest Bank Ampitheatre. | Curtis Lehmkuhl~Sun-Times Media

Kerry King of Slayer performs during the band's set at the Rockstar Energy Drink Mayhem Festival July 21 at the First Midwest Bank Ampitheatre. | Curtis Lehmkuhl~Sun-Times Media

Tom Araya of Slayer performs during the band's set at the Rockstar Energy Drink Mayhem Festival July 21 at the First Midwest Bank Ampitheatre. | Curtis Lehmkuhl~Sun-Times Media

Dave Lombardo of Slayer performs during the band's set at the Rockstar Energy Drink Mayhem Festival July 21 at the First Midwest Bank Ampitheatre. | Curtis Lehmkuhl~Sun-Times Media

Slayer performs their set at the Rockstar Energy Drink Mayhem Festival July 21 at the First Midwest Bank Ampitheatre. | Curtis Lehmkuhl~Sun-Times Media

Kerry King (left) and Gary Holt of Slayer perform during the band's set at the Rockstar Energy Drink Mayhem Festival July 21 at the First Midwest Bank Ampitheatre. | Curtis Lehmkuhl~Sun-Times Media