This article aims to connect issues in the epistemology of modality with issues in the philosophy of music, exploring how modalizing takes place in the context of musical performance. On the basis of studies of jazz improvisation and of classical music, it is shown that considerations about what is sonically, musically, and agentively possible play an important role for performers in the Western tonal tradition. We give a more systematic sketch of how a modal epistemology for musical performance could be (...) constructed. We argue that it is necessary to adopt a pluralist approach toward the modal epistemology of music. (shrink)