Given Activision's love of releasing ten billion Guitar Hero games a month, it's somewhat surprising that the evil publisher has taken so long to wrap its tendrils around iTunes. Titles like Tap Tap Revenge have already demonstrated a healthy portable music game market, while rivals such as Rock Band and Guitar Rock Tour have already settled into the market. 

Still, better late than never. Guitar Hero has finally stamped its boot into the iTunes market, with a little help from Vicarious Visions. The question, of course, is how well Guitar Hero translates to the iPhone, and how does it compare to the music games already available to Apple thralls? Well, that's what this review is for, stupid!