Can you solve the "mystery" of the above piece of music?
I can't say too much about what you're looking for since that might give it away, but you should be able to tell when you've found it. (I.e., if you're not sure, then keep looking because you haven't found it.)
If you want to listen to it, just click on it. (If your web browser is not configured to play midi files, clicking on it will download it instead. After saving it, you should be able to just double-click on the saved file to play it. If even that doesn't work, you're on your own. :-)