The Papa Roach singer joined Disturbed during their covers medley at Rock on the Range, rocking out to Rage Against the Machine's 'Killing in the Name.'
Anyone who has ever battled the demons of drug or alcohol addiction or ever loved someone who has fought to get clean knows just how real the fight is. Once you stop, you are not "healed;" the battle continues to be a daily struggle every second of every minute of every day for the …