Aasimar
Atheist
I ran into this video and was quite amazed. While it's a complete waste of time, it's still fairly amazing to me that someone can do this. So as to not spoil it, try to guess the song this guy is singing before the 1 minute mark, and bear with the whole video or you'll just be confused. Oh, and don't scroll down or you'll read comments that give the answer away, and don't read the posts in this thread until after either.
YouTube - What song is this?
YouTube - What song is this?