It is an honor to provide such a gem to the wide spectrum of the Floyd community!
The entire 24 minute ending scene from 2001: A Space Oddyssey synced to the Pink Floyd song 'Echoes'. I couldn't find a full version of this scene on youtube, so I decided to put it up. I don't own the rights to this stuff and all that jazz. Be warned that this is the final scene of the movie, so don't watch if you haven't seen the movie already and don't want the ending spoiled.
One rumor I've heard behind this is that Floyd had done a soundtrack in the past for an Italian film that was considered such a disaster for a variety of reasons that they swore not to do another. So they denied Kubrick when approached to score it and immediately regretted it upon viewing of †he film. The rumor is they recorded Echoes on the Meddle album to score with the last section of 2001, which it clearly does.