Agree with you guys, and I think the tune is one of the best ever on the C64. It really takes a few unexpected roads and at the same time is very commercial (people even hummed it while it was playing for the first time at X2008).
What I also like is that it has something universal about it, probably because of its smoothness. There's in my view, no sign of the demo ever loading. It's pleasing to anyone, even if they're on PC, Mac or whatever.