Ever since Guitar Hero first graced our Playstation 2's a few years back, the music video-game genre has never been the same. In a genre that was once dominated by the likes of Beatmania and Dance Dance Revolution, Guitar Hero has expanded into one of the most recognizable brands on the planet; not just in the video-game industry, but also in the entertainment industry as a whole. There's also Rock Band, which has developed a strong niche audience with its indie and lesser known track listings and slightly different gameplay. Since the first Guitar Hero, we've been subjected to nearly 20 titles across both franchises - with several average spin-offs in Guitar Hero Aerosmith and Rock the 80s - and with the latest entry in Guitar Hero Greatest Hits, we get the best of some of the earlier Guitar Hero games. But does this latest addition justify an encore?