I also knew it was Also Sprach, but since Raak said 'Film music' I replied with the title of the film. On a related note (maybe) it impressed me that 'classical' music was used for that film. Nothing dates a film so much as its soundtrack when a contemporary score is used - even more so when it tries to sound 'futuristic' - so it was a smart decision to choose something timeless, I think.
I heard the choice of music was more-or-less accidental though - something about that they just used Strauss as a test soundtrack but it seemed to fit so they used it for the final film.