A band no one would have ever known about if it weren't for Guitar Hero II.
(A kid walks in a room wearing a Dragonforce shirt)
Kid 2: "What's Dragonforce, some stupid band?"
Kid 1: "Yeah right they rock!"
(Kid 2 plays Guitar Hero II and walks in with a Dragonforce shirt the next day)
Kid 1: "I thought you said Dragonforce was a stupid band?"
Kid 2: "I heard them on Guitar Hero II, they rock, I'm gonna get all my anime friends to wear the shirts!"