Came across an interesting media format I'd never heard of before: Scopitone.

It was essentially 16mm film tied into a jukebox. So like a jukebox for music videos, but back in the 1960's, 20 years before music videos became popular.

Interestingly, I saw Procol Haram's A Whiter Shade of Pale listed as having a video made for the format. I distinctly remember when they had a brand new video made for that song in the 1980's. Different video though. Turns out they actually made 4 videos for that song (3 in the 60's, and then the one I've seen).