I see a bunch of remixes but nobody uploaded the original. Here it is, the famous Comic Bakery tune by Martin Galway.
EDIT: 2/23/08 - I'd like to thank J14W31 for pointing out that the main melody is referenced almost verbatim in the Jurassic Park games for NES and Gameboy in these two Youtube videos:
watch?v=JlonCdEJckQ Starting at 1:36 watch?v=8SXqIZoprJQ Starting at 0:43
Just to clarify, I'm fully aware this song was totally lifted for the Jurassic Park games, but it's still kind of neat.
Just a little note, I've experimented with different SID emulators and right now I'm still using the ancient sidamp, but it's fast and good enough. It's also the only one I've used that doesn't have problematic sample timing.