I haven't found this anywhere. I discovered it by pure happenstance while fooling around on Adobe Premiere.

What you need:
Audio: Pink Floyd's Wish You Were Here
Video: Fritz Lang's Metropolis

I discovered this with the divx DVD rip that's been going around. I made some room for credits in the beginning, lining up the first visuals with the first powerful swell in music at about 4 min 20 sec. Everything lines up from there, though it'll obviously vary as there are many different edits of Metropolis around.

Clues:
I find it very likely that this may be one of those deliberate dubs. The workers and clocks are to the beat of the first set of "Shine on You Crazy Diamond"'s. The sound effects at the beginning of "Welcome to the Machine" correspond with the actions on the screen. You know you've got it right if the 'thud' lands on the part where the engineers hand lands on the valve and falls. After that, the steam whistles all correlate and it's ****ing amazing.
After that, some of my synchs were dissapointing, but the associations were still thematically compelling.
"Have a Cigar" goes very nicely with the scene where the main character's father is trying to explain that they own the town and not to be worried about the workers. "Wish You Were Here" has the father firing an assistant, who then tries to kill himself, though the main character stops him near the end of the song. The last track (Shine on You Crazy Diamond, Pts. 6-9) begins exactly as the main character is opening the door to the work-machine and the steam that comes out links with the wind on the soundtrack. Once again, I'm in a world where a lot of things synch up nicely. The adjusting of the machine dance that the main character does links up with the music's meter many times, and the robots first steps are accompanied by a neat change in the music. I don't feel like this one ends quite as satisfactorilly as the ending to Dark Side of the Rainbow. Maybe another album finishes the film? Definitely worth investigating.