I think what misophist was getting at was that too much control over "intellectual property" kills the property and ensures no one else will want to perform it. I may not like what someone does to a song I wrote word-wise, melody or arrangement-wise, but I don't think I'd ever try to stop anyone from doing it.

There is only one instance and one version of Van Gogh's "Starry Night," and that is all there will ever be.