I agree that attribution / authorship is a muddled concept and always has been. It's interesting, even in low-tech formats, to compare the attribution models across media. In academia, citations in theory track the provenance of all key ideas and facts, whereas in recorded music, performance art, etc. there is no real analogue. Of course something approximating it is forced by the legal regimes around sampling in music, but nothing comparable exists for "conceptual sampling." I've always thought it would be cool if an artist could annotate a soundcloud-like player with the sources/references behind particular moments.