Here's one I was looking for, an electronic album available on c64 cartridge: https://www.youtube.com/watch?v=qGWsPEC341Y A riff on skype: https://www.youtube.com/watch?v=pnIiui46ggY

Some more: https://www.youtube.com/watch?v=Slf7YjsXidM

Still can't find the one I wanted to share....