Throughout Guitar Hero, there have been generations of it.

Gen 1 Origianl HOPO System

Guitar Hero

Gen 2 2nd HOPO System

Guitar Hero 2 Guitar Hero Encore

Gen 3 Current HOPO System

Guitar Hero 3 Guitar Hero Aerosmith

Gen 4 Full Band & Slider

World Tour Metallica Smash Hits Van Halen

Gen 5 HOPO Chords (Now common, Extremely Rare before ex. The Metal GHOTMH)

GH 5

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