Lots of stupid, impractical stuff in this thread. I don't give a fuck about the media conglomerates EXCEPT they do spend the money to preserve the original sources.
Commercial master owner's concerns do have contractual obligations not passed on to the PD folks - Sony/BMG have to pay royalties to the estates of Ellington and Armstrong (for example) not paid by companies in "50 year" countries (JSP, Definitive, etc). Add to that the expense of preserving the masters and you have a recipe for a huge cultural purge.
I'm just presenting the dilemma.
I do have a "fish in the pond". In 1967 I borrowed money to record some music and continued to work this way until today. Eleven years from now this material will be PD and subsequent sessions fall by the year. If I had spent the money on "physical" property, I could pass this on to my children and they to their children, etc.
In numerous threads on this topic I have suggested a compulsory license as used in the print music business, but nobody seems to care. These folks don't want solutions, they want cheap music when they want it. Selfishness on all fronts.