This guy is amazing! I prefer his version of the soundtrack to the original (below) as well!
And here is how not to record your own soundtrack…
And I guess it is very geeky of me to know that that really bad rendition was the soundtrack to Super Mario Land on the Game Boy!
Here is a good version of the Super Mario Land soundtrack- though its not as good as the Donkey Kong one:
Make sure you watch until 2minutes in though as that bit is amazing!
This guy is pretty good too..