"Compare e.g. folk music to classical or baroque. The latter is fine art, the former is not."

Uh, no. Sorry, but no.

Actually, while I firmly believe that most of the work we see in the galleries would be examples of great craftsmanship and not art, I dont think one can just cavalierly write off something as "not fine art" simply because it's populist in nature. Mozart was, in his time, a pop musician, the equivalent of a folkie today. Yeah, he used orchestras for his music, but his intent for most of his work was little different than the Jonas Brothers today. "The Magic Flute" was his era's version of a Broadway musical.

So when did this pop star become "fine art"?

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