Of course, this already exists. The reason he is given that status is because the players, the other musicians who are working with him, felt that he was giving a kind of creative direction that warranted that respect. So there there is a complex exchange between Miles and the other musicians that stabilized Miles' identity as the 'author'. There will be no other option really. The problem with this then is that it then becomes a matter of power or money whether one gets any degree of authorship at all.
History is very easy to manipulate in that sense.
If the idea has legs. At least it creates more of a possibility for that. For example when you look at web art. There is a certain kind of superficial political claim that because the WWW is nominally a site of free information exchange sites based on appropriating from other sites are 'making sure' that is the case. The problem is that appropriation is at least in part a form of virtuoso consumption.