I find them great to relax to. Most of it is terrific chillout music and visuals.
The demoscene is an international computer art subculture focused on producing demos: self-contained, sometimes extremely small, computer programs that produce audiovisual presentations. The purpose of a demo is to show off programming, visual art, and musical skills. Demos and other demoscene productions (graphics, music, videos, games) are shared, voted on and released online at festivals known as demoparties.
Is there a good aggregator for demos? Or should I just start watching some on YouTube and hope the algorithm starts including them?
There are good demoscene playlists on YouTube. I’d start there. Unfortunately, the live streaming demoscene video website seems to be gone now.
For the complete stockpile of original demo files, check out:
https://www.hornet.org/#new_to_demos
and
https://scene.org/
Or regular video streaming websites for just the visuals.