Check out this great, 3 part documentary titled “What the Future Sounded Like” about EMS, Electronic Music Studios, the company which made the famous VCS3 synthesizer in the late 1960s, which was used in some very famous recordings by artists such as Pink Floyd, Hawkwind, Kraftwerk,King Crimson, Brian Eno, etc
The documentary was directed by Matthew Bate and was never made available commercially because the rights to the music on the film were too expensive to license.
What the Future Sounded Like pt. 1
What the Future Sounded Like pt. 2
What the Future Sounded Like pt. 3