A 256-byte music demo: https://linusakesson.net/scene/a-mind-is-born/

I haven’t followed the scene much in the past 20 years (after obsessing about it in my teen years), but Nano Gems seems like a good resource:

https://nanogems.demozoo.org/

8-bit Guy has a great video on the history of the demo scene: https://www.youtube.com/watch?v=Bdh5I7F1oMs

cdak (https://www.pouet.net/prod.php?which=55758 / https://www.youtube.com/watch?v=RCh3Q08HMfs)