Okay: Three of your favorite Demoscene soundtracks (soundtracks to actual demos)
I'll start:
Atrium OST by Puryx - I was pretty blown away when I saw and heard this 64k ... until I realized it was a 4k !! and I was floored. The music 100% makes this demo. Wonderful softsynth use.
https://demozoo.org/music/5627/
Babylon by Necros - There's something about Necros's compositions that I just love. And it bled into his post-demoscene work as well (I have several of his CDs). This is a real work of tracker art.
https://demozoo.org/music/148542/
Delicious OST by Ludvig Linge - A Dreamcast demo by Yodel. It's a bit haunting, but with some spoken samples that provide almost comic relief. And the ending lead is just superb! This is a streamed tune.
@elb Size-limited demos are some of my favorite work in the scene. The creativity that comes out of the crazy limitations of a 4k demo is super fun to watch.
@48kRAM I haven't looked at the others, but I just watched Atrium, and ... wow. The sound track alone seems like it should be > 4 k!