This collection of essays investigates the work of Heinrich Glarean, one of the most influential humanists and music theorists of the sixteenth century. For the first time, Glarean's musical writings, including his masterwork the Dodekachordon, are considered in the wider context of his work in a variety of disciplines such as musicology, history, theology and geography. Contributors reference books from Glarean's private library, including rare and previously unseen material, to explore his strategies and impact as a humanist author and university teacher. The book also uses other newly discovered source material such as course notes written by students and Glarean's preparations for his own lectures to offer a fascinating picture of his reactions to contemporary debates. Providing a detailed analysis of Glarean's library as reconstructed from the surviving copies, Heinrich Glarean's Books offers new and exciting perspectives on the multi-disciplinary work of an accomplished intellectual.