I'd definitely be keen to hear more about this at least!
I've been thinking about hash values for song sections, and then proving ownership by claiming a sequence of hashes. Could help ensure you aren't subconsciously ripping other music off, and make finding 'related' songs easy (covers, remixes, etc).
That, there, is the hard part of the problem. You can go with acoustic hashes (like Chromaprint[1]) but even that's not 100% reliable in the face of small changes.
I've been thinking about hash values for song sections, and then proving ownership by claiming a sequence of hashes. Could help ensure you aren't subconsciously ripping other music off, and make finding 'related' songs easy (covers, remixes, etc).