By "demos" I mean the programs you would download and run for no other purpose than to see how far your computer could be pushed in the sound & graphics department. It was a fun time (80s and early 90s). Like this: www.youtube.com/watch?v=c5kuYfTCGLg
That's what hackers used to create, in addition to cracking disks and sharing illegal music. Today's hackers rarely create this unique piece of art.