Because I'm determined to ensure that no one takes this blog seriously before 11am (just because you all like to visit the blog early, doesn't mean I'm awake), and because I referenced Megan Man 2 boss music in the Fred Thompson post below, here this is:
It's worth saying that I was actually thinking of the cut screen music when you choose a level, but I couldn't find that. Update: You can see the actual sound clip in this video. And if you have a Mac, you can make it an integral part of your computer.