I'm sorry to offer a dissenting opinion, but I am in favor of the 20 year extension to the copyright. This extension merely brings older copyrights up to date with the "life of the last surviving author + 50 years" current US copyright law and the Euro laws.
I don't see where a composer's creative property differs from real property (land,stocks,gold). The most vocal opponents of copyrights are restaurant and tavern owners who are forced to pay their employees, rent, liquor supplier, and taxes....who can thay try not to pay? Composers and authors, of course.