If you've played video games to any capacity and remember the music, then you'll appreciate OCR. It's a community of mostly fan submitted remixes of video game music with a tight selection process so that the remixes are actually decent at the worst and very, very good at the best.
It's also always very interesting to hear a particular theme or sequence remixed in a different style. In fact, video game music remixes could be considered a whole sub-genre of its own thanks to OCR. It's free to download remixes and it's always interesting reading the judges' comments on a new addition.