This chapter makes the case for the claim that the type/token theory is the prima facie answer to the categorial question: that is, the account that must be accepted unless it is defeated. This it does by arguing that the type/token theory gives natural and convincing explanations of two phenomena: the fact that musical works are repeatable (i.e., susceptible of multiple occurrence), and the fact that we listen to a work by listening to one of its occurrences. The effective way in which the type/token theory provides explanations of these phenomena is favourably contrasted with the attempted explanations offered by its standard competitors: the conception of musical works as sets of sound-sequence-events, the view of such works as properties of such events, nominalist theories, and anti-realist accounts.
Keywords: anti-realism, nominalism, property, repeatability, set, type, Platonism