With over $2 billion in sales worldwide, the "Guitar Hero" franchise has become a bona fide cultural institution. Even if you haven't played the game, you probably feel that you have, thanks largely to the game's appearances in an episode of "South Park," a Mariah Carey music video, and the dramatic climactic showdown in "Couples Retreat." In honour of "Guitar Hero" and its cultural pervasiveness, inMovies takes a look at some of the silver screen's greatest guitar slingers.