I wonder if there's a cover band out there that plays nothing but songs from Guitar Hero. They would have started by learning the easy songs and then moved on to the harder ones just like in the game, so that depending on when you saw them over the course of a year (or release cycle, I suppose) you'd be hearing different songs. After they went through the whole list of tunes, they'd have gone back through and started over on a higher difficulty setting. Maybe that means the second time through they got the second guitarist to start playing the lead parts instead of both guitarists just playing the easier rhythm part.
Then they'd have had to do it all over again when Guitar Hero II came out.
When development shifted over to Neversoft, I wonder if the band fractured into two, with one half learning the songs from Guitar Hero III and the other half devoting their efforts to Rock Band.
I wonder if an analogous band exists for Dance Dance Revolution.
Current Music: Crowded House - Time On Earth