A missed opportunity, indeed.
The attention whores who made this -- which cannot earnestly be called a documentary -- wanted nothing more than to show off, drop names and spend a few sunny days in London, Paris and Rome. In all other regards they obviously didn't care.
Zero research. "Jungle obsession" gets mentioned, and all the presenter (think Tiny Tim, with a bigger guitar) has to say about the composers is that "not much is known about them".
Yes, darling. If you're too blasé to seek out knowledge you'll never know much about anything.
(I just found an interview with Hannelore Warner, widow of Eddie Warner:
https://spaceoddities.bandcamp.com/album/space-oddities-studio-ganaro-feat-roger-roger-nino-nardini-eddie-warner-1972-1982. Scroll to the bottom of the page.)
The Warners are German. Eddie had to leave Germany when Hitler took power and went to France. There, he later met Hannelore and became friends with Roger Roger and Nino Nardini (Georges Teperino). Then he founded L'Illustration Musicale. Hannelore took care of business, Eddie was responsible for the artistic output, collaborating with Roger and Teperino. They were classically trained musicians who became interested in electronic instruments and bought a lot of them for their studio, in the 1960s and '70s. There's a fantastic story and an entire documentary in this alone.
What about German labels and composers? All that the film manages to come up with is how good Selected Sound's record covers look on the shelf (agreed!), and "Klaus Weiss is great". Agreed as well. So, then?
They simply didn't feel like going to boring Hamburg, Frankfurt or Munich. If there were library labels in Berlin, they might have made the trip. But there aren't any.
What about the rappers and hip-hoppers who are the apex predators in the library music world? I would have loved to hear what they think about the topic besides "fab record". That would have been a lot more worthwhile than watching random collectors holding their trophies into the camera.
All a bit lazy -- a laziness enabled by crowdfunding. If the makers had had to get the funding from someone personally this film would have come out very different, or not at all. Nobody in his right mind would give more than a tenner for such a clueless, self-serving approach. But ask a million people, and it's not a problem.