In a related area, as a research scientist I have published over 50 articles in various research journals, but I have to sign over my copyright to the journal publisher in order to be publised. In strictly legal terms I would have to obtain permission from the publishers to copy or quote my own work! The publishing lobby has worked hard to influence copyright laws in their own interest. So much for protecting my "intellectual property rights." So this is a very broad problem, not only for many musicians, but others also.
S. in Seattle