I've never heard that about John Williams, but it's probably not quite the same sort of thing. He must watch the nearly-finished rough cuts dozens of times in t

I've never heard that about John Williams, but it's probably not quite the same sort of thing. He must watch the nearly-finished rough cuts dozens of times in the process of scoring (which is one of the last steps in the movie making process). Then again, on the screen behind the orchestra, during the recording process. By the end, he probably knows the movie by heart and isn't excited to watch it yet again, just to see the last bit of polish. That's pretty different from recording some voiceover lines in a studio then never even seeing the movie they fit into.