It reminded me that a few years back, I was thinking it would be really cool if somebody sold a sort of "learn the secrets of recording and mixing" CD-ROM which was some number of classic well-produced songs in master form and a mixing interface so you could isolate tracks and hear all the subtle details, plus an as-accurate-as-possible mix that you could play with and see what went into it. The problem is, I suspect the market for such a thing would be fairly small--although there are a lot of people with home/project studios so maybe there'd be some appeal, but they'd all have different musical tastes and have different songs they'd be willing to tear into. When I saw Harmonix demoing their game Amplitude I asked how they did the live remixing technologically, and they said they did just get access to the master tapes; and that included at least one old song (Rock It, was it?) I dunno, maybe it was all music owned by Sony, though.
It seems like such a thing should be possible in the abstract, at least, and I'm sure it's technologically possible; I'd even be happy to write the code for a project like that if that somehow made it happen. But, like I said, I don't think there's a large enough market that you could ever get the license owners interest and get the master tapes etc., and even if there were I'm certainly not enough of a people-person or biz-person to drive such a project.