Philip Glass normally lets a piece go after he has written it. Glass Notes:
I once asked Glass about this when the conductor of an opera asked him about a certain tempo, Glass responded that it was his opera now, that he had written it thirty years before, and that he wouldn't always be around to answer questions. He was more interested in what the interpreter had to say about it rather than telling him how the composer thinks it should be done. I again questioned how he resisted the urge to jump in and take control? He responded "It's easy, I've written 90 pieces since that one."
The Seventh Symphony may be the exception. Hear fragments of before and after.