by the seat of your pants
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When you perform in front of an audience after only two days of rehearsal, you're flying by the seat of your pants - particularly when they're rewriting the show right up to the moment the camera goes on.
There are no rules and regulations for perfect composition. If there were we would be able to put all the information into a computer and would come out with a masterpiece. We know that's impossible. You have to compose by the seat of your pants.