Even the members of Green Day would probably object to being ranked higher than the Ramones and the Clash on this list, but the Internet has spoken and we have to honor that. It's easy to forget now, but by the early 2000's, Green Day seemed washed up. They were reduced to opening for Blink-182 in the summer of 2002, and it was hard to imagine them making a comeback – let alone becoming one of the biggest bands on the planet. Then again, nobody saw American Idiot coming. The brilliant 2004 rock opera forever changed their career, and suddenly they were playing stadiums and scoring more radio hits than any band on the planet. 2009's 21st Century Breakdown didn't quite live up to American Idiot, but it hardly mattered.