The idea of the healing power of music-rooted in Platonic and Aristotelian psychologies and Galenic humoral theory-has a long-standing tradition in European intellectual thought and occurs in several texts of the medieval and early modern periods. In contrast to the abundance of references in theoretical discussions, however, historians today face the scarcity of evidence documenting specific, actual uses of music as therapy. Among such rare evidence are two documents emanating from the chancery of late-fourteenth-century Bologna, which form the focus of this article. The documents, which concern a musician and an itinerant healer, provide new insights into musical practices directed in particular to the cure of psychic sufferings. The documents make clear that the secular authorities of Bologna considered the agency of these two practitioners and their medical and musical skills to be crucial for maintaining or restoring individual and collective health. The evidence discussed here suggests that the use of music toward curative ends must have been more widespread than hitherto acknowledged. It also highlights the powerful association between notions of musical healing and ideas of individual and civic well-being that underlay the Bologna officials' idea of the state.1 Useful outlines of ideas on the impact of music on the body and soul in the ancient and medieval traditions may be found in Francesco Pelosi, "Music, Mind and Well-being in Antiquity" and Andrew Hicks, "The Regulative Power of the Harmony of the Spheres in Medieval Latin, Arabic and Persian Sources," in The Routledge Companion to Music, Mind and Well-being, ed.