It has long been claimed that opera can give expression to the uneasy relationship between the body and the voice. Operatic voices seem to exceed the capacity of the bodies that produce them in a way that conveys a sense of mechanisation or limited agency, inviting metaphorical comparisons to marionettes. Yet recent studies of gesture have suggested that bodies are not simply passively inscribed with meaning but that they also mediate the process of inscription. Investigating the implications of this claim for opera, this article discusses two recent essays by Judith Butler, in which she draws from Walter Benjamin's account of gesture in Brecht's epic theatre to argue for the performative power of incomplete or decontextualised bodily actions. It then traces this idea to a moment in epic theatre's own prehistory, focusing on Ferruccio Busoni's opera Doktor Faust. The article makes both a theoretical point and an historical claim: it highlights how bodies and words that are decontextualised can perform a critical function despite not enjoying the usual citational supports necessary for a speech act; and it argues that Busoni's Doktor Faust and his theory of opera were a part of the intellectual prehistory to Butler's conceptualisation of bodily performativity.