That's been pretty frequent for me lately.
Funny thing about the game this music is from: My mother loved it.
She's never really been big on computer/video games apart from solitaire and other simulations of real-world games (to the point of occasionally being something of an anti-game person), but she started playing Cosmo Bots/Cosmic Bugs at some point.
She like the demo, bought the full game, and played every level. (The game had a hundred levels, too, so that's not like it's a small time investment.)
It makes me feel kinda bad that my kid brother and I unintentionally deprived her of her primary chance to play the "sequel," Water Bugs, on the weird "arcade machine" service that was on one of our later computers. (There was a time/coin limit thing, and she didn't want to drop more money on it than she had already.)