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Almost any musical work can be performed in a variety of ways. So a performance, even one by the composer, is not the work itself.  Music notation can represent a work, but there can be several equally valid ways of writing down the same thing.  Therefore, a score is not the work either.  Perhaps it is most accurate to say that a score or a performance represents an instance of a work, which is a concept, not a physical entity.
'start' vs. 'begin'
'beam' not 'thick black line'
separates logical, visual, gestural, and analytical domains