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Alex Ross has linked to the text of his keynote speech at the Chamber Music America National Conference. As always, he has a lot of interesting and thought-provoking things to say. This sentence struck me as shedding a particular kind of light on one important difference between concert-notational music and other kinds:
I can’t honestly say that Beethoven’s C-sharp minor Quartet is by any meaningful measure “better” than, say, Duke Ellington’s Come Sunday as sung by Mahalia Jackson.
I'm not saying that the difference here is a quantitative "better-or-worse" kind of difference, but rather a qualitative "nature of the beast" difference.