In this video from Red Bull Music Academy, Patrick Pulsinger demonstrates his passion for 20th Century modular synthesizers. If you know what a Moog is you know what I'm talking about. If not, this is a great way to see how electronic sounds and music used to be made.

It's a little disjointed and it's not a "how-to" video or a complete guide. It's just a random yet charming insight into the art of analog synthesizing.