This paper discusses mistakes that occur in improvised musical performance. I first develop a couple of distinctions that are useful to understand the varied nature of such mistakes. Particularly, I think that it is important to distinguish mistakes that depend upon formal features of the music, and mistakes that are such in virtue of a failure of the performer’s intentions. Within this latter category, I argue that it is useful to distinguish between two different layers of performance intentions. Subsequently, I (...) discuss the idea that, in improvised performance, mistakes are not merely tolerated but are, in some sense, valuable, showing how the distinction I develop can shed some light on these issues. (shrink)