Guys this is really a nice finding by a friend of ours. The 2006 music documentary “What the Future Sounded Like” is a 27 min lasting australian short film about the british electronic music scene.
In contrast to many other documentaries, “What the Future Sounded Like”, covers the time between World War 2 and the 1970s, when computers where not available.
“It was a period of sweeping change and experimentation where art and culture participated in and reflected the wider social changes. In this atmosphere was born the Electronic Music Studios (EMS), a radical group of avant-garde electronic musicians who utilized technology and experimentation to compose a futuristic electronic sound-scape for the New Britain.” (Source)
Among many other places it has been screened in Berlin at the Musik-Film-Marathon in 2012. It is now available for everybody via Youtube.
In case you got issues watching the documentary because of blockings or dictatorship-like censoring in your country, try this automized unblock link. Or try this manual link and copy/paste this address: http://www.youtube.com/watch?v=8KkW8Ul7Q1I