 Musical ontology is the study of the kinds of musical things there are and the relations that hold between them. The most discussed issues within this field have been the metaphysical nature of works of classical music (the “fundamentalist debate”), and what it is to give an “authentic performance” of such works. Recently there has been growing interest in the ontologies of other musical traditions, such as rock and jazz, and discussion of the methodology and value of musical ontology. (For a more detailed overview of these debates, see Kania 2008a,b, 2013b, and Matheson &amp; Caplan 2011.)