not sure if there's anything more to the quote, but just going from what's there, i'd tend to disagree b/c it's a textbook example of a kind of essentialist position (i.e. "music is, by it's very nature, essentially. . ."). this one's particularly difficult to assess as he doesn't define what he actually believes music to be.
"The over-publicized bit about expression (or non-expression) was simply a way of saying that music is supra-personal and super-real and as such beyond verbal meanings and verbal descriptions. It was aimed against the notion that a piece of music is in reality a transcendental idea "expressed in terms of" music, with the reductio ad absurdum implication that exact sets of correlatives must exist between a composer's feelings and his notation. It was offhand and annoyingly incomplete, but even the stupider critics could have seen that it did not deny musical expressivity, but only the validity of a type of verbal statement about musical expressivity. I stand by the remark, incidentally, though today I would put it the other way around: music expresses itself."
Igor Stravinsky and Robert Craft (1962). Expositions and Developments.
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