Back to OP's main point briefly: he seems to be saying that because we can copy a song and distribute it ad infinitum, that the song is abundant. That somehow an item's abundance is related to how many copies of it exist. But this is really a form of artificial abundance, right? In an important sense, songs are actually scarce, because it's not trivial to produce a good song. A song is a special type of good that can fall prey to artificial abundance, which really screws with the incentives to produce songs.
This is the problem that Bitshares Music is trying to solve: the illusion of abundance that the Internet produces has caused incentive problems for musicians. Record labels tried to solve the incentive problem by legislating scarcity, and that approach has mostly turned out to be a huge failure. Bitshares Music is just a new approach to the incentive problem, one which I suspect may turn out to be a bit more successful.
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