I found that clip.
Originally Posted by MikeM
Somewhere on the net, I found a piece of audio of Rush playing Limelight before NP finished writing his drum part and definitely before it was recorded for Moving Pictures. It was radically different. I like what he settled on better, but it does make the point that any part can be revisited at anytime and improvements made - even for Neil Peart.
Sometimes I get so used to hearing him playing a song a certain way that I lose sight of all the ideas he must've tried and discarded during the writing process.