In the early 2000s Green Day seemed like they were slowly dying. It got so bad that in 2002 they actually opened up for Blink-182 on a long summer tour. But in 2004 they shocked everyone with the politically-charged rock opera American Idiot. It sold millions upon millions and introduced them to a whole new generation of kids who were barely out of diapers when Dookie came out. "Boulevard of Broken Dreams," the second single, went into heavy rotation on radio in late 2004. It was only the beginning of the band's huge comeback.