If you aren't a trained musician yourself, it's much easier to judge someone else's level of talent when they perform a song that's very familiar. Rob Landes demonstrates the different levels of musical complexity with the ultra-familiar Mario theme. Yes, we recognize and enjoy the theme when it's played as a simple melody by a n00b, but then he ups the difficulty level just like the video games do. By the end, it feels like we're playing the game! -via Boing Boing