For make no mistake: the subject of this book is not the origin of the work-concept. Its subject is the origin of the somber, socially regressive nonsense that people have been spouting about classical music for the last hundred years, a line of propaganda that has - obviously, to all but the spouters - been losing ever vaster tracts of ground since at least the 1970s.
-Richard Taruskin, in the foreward to Lydia Goehr's "The Imaginary Museum of Musical Works"
I just (finally!) started diving into this "essay in the philosophy of music," written in 1991, revised in 2007. It's not easy reading, but I'm enjoying it so far. If you're looking for a philosophy of music that expands beyond the notions of music as an object; for a book on contemporary musical thought; for a rationalization of your thoughts, or to be challenged on your ideas of music ... this is a good book to read.