In 1988, Michael Nyman composed the score for Peter Greenaway's film Drowning by Numbers (or did something that we would ordinarily think of as composing that score). We can think of Nyman's compositional activity as a ‘generative performance’ and of the sound structure that Nyman indicated (or of some other abstract object that is appropriately related to that sound structure) as the product generated by that performance (ix). According to one view, Nyman's score for Drowning by Numbers — the musical work — is the product generated by Nyman's compositional activity (namely, an abstract object) and, more generally, artworks are identified with the products generated by compositional or other creative activities. Let's call this view The Product Theory. By contrast, according to another view, Nyman's score for Drowning by Numbers is the generative performance itself (namely, Nyman's compositional activity) and, more generally, artworks are identified with generative performances themselves.
Modeling and Eigenfrequency Analysis of Sound-Structure Interaction in a Rectangular Enclosure with Finite Element Method
