Before Rocksmith, before Rock Band, before DJ Hero and Sing It, there was Guitar Hero. Can you think of a single, video-game-playing friend that doesn't have a plastic guitar somewhere in their house? This game caused people to flock in droves to their local game stores and retailers to form lines behind the demo station. You want to talk about longevity? Guitar Hero was first published in 2005 and has inspired six direct sequels and eight spin-off titles such as Guitar Hero: Aerosmith, Guitar Hero Encore: Rocks the 80s, and Band Hero. This rhythm game juggernaut also made its way to portable and mobile platforms, proving that players just couldn't get enough. We wouldn't have the plethora of high-quality rhythm games that we now enjoy if Harmonix didn't prove that tens of millions of gamers were eager to engage with their home consoles in a totally new way - and feel like freaking rock stars while doing it. I still get a rush playing Cliffs of Dover on expert.