The Speculum musicae of the early fourteenth century is by a long way the largest medieval treatise on music. For nearly a century, its author has been known as Jacques de Liège or Jacobus Leodiensis. ‘Jacobus’ is certain, fixed by an acrostic declared within the text; Liège is hypothetical, based on evidence shown here to be less than secure. New documentary evidence identifies its author as ‘Magister Jacobus de Ispania’. It is here suggested that the author of the Speculum is either someone who left no paper trail or James of Spain, a nephew of Eleanor of Castile, whose career is documented mostly in England. The book traces his career and the likelihood of his authorship of the Speculum musicae.

The Speculum musicae of the early fourteenth century, with nearly half a million words, is by a long way the largest medieval treatise on music, and probably the most learned. Only the final two books are about music as commonly understood: the other five invite further work by students of scholastic philosophy, theology and mathematics. For nearly a century, its author has been known as Jacques de Liège or Jacobus Leodiensis. ’Jacobus’ is certain, fixed by an acrostic declared within the text; Liège is hypothetical, based on evidence shown here to be less than secure. The one complete manuscript, Paris BnF lat. 7207, thought by its editor to be Florentine, can now be shown on the basis of its miniatures by Cristoforo Cortese to be from the Veneto, datable c. 1434-40. New documentary evidence in an Italian inventory, also from the Veneto, describes a lost copy of the treatise dating from before 1419, older than the surviving manuscript, and identifies its author as ’Magister Jacobus de Ispania’. If this had been known eighty years ago, the Liège hypothesis would never have taken root. It invites a new look at the geography and influences that played into this central document of medieval music theory. The two new attributes of ’Magister’ and ’de Ispania’ (i.e. a foreigner) prompted an extensive search in published indexes for possible identities. Surprisingly few candidates of this name emerged, and only one in the right date range. It is here suggested that the author of the Speculum is either someone who left no paper trail or James of Spain, a nephew of Eleanor of Castile, wife of King Edward I, whose career is documented mostly in England. He was an illegitimate son of Eleanor’s older half-brother, the Infante Enrique of Castile. Documentary evidence shows that he was a wealthy and well-travelled royal prince who was also an Oxford magister. The book traces his career and the likelihood of his authorship of the Speculum musicae.

Music theorists labelled the musical art of the 1330s and 1340s as 'new' and 'modern'. A close reading of writings on music theory and the polyphonic repertory from the first half of the fourteenth century reveals a modern musical art that arose due to specific innovations in music notation. The French ars nova employed as its theoretical fundament a new system for arranging musical time proposed by the astronomer and mathematician Jean des Murs. Challenging prevailing accounts of the ars nova, this book presents the 'new art' within the intellectual context of its time, revises the datings of Jean des Murs's writings on music theory, and presents the intersection of theory and practice for a crucial era in the history of music. Through contemporaneous accounts, Desmond explores how individuals were involved in 'changing' music in early fourteenth-century France, and the technical developments they pursued that precipitated this stylistic change.

The Tractatus de tonis of Guy of Saint-Denis (written ca. 1300-10) differs from other treatises on plainchant in the depth of its analysis of the various tones into which chant was traditionally classified. Guy's treatise presents itself as a synthetic overview of both the theory and practice of plainchant in a way that combines the practical reflection of Guido of Arezzo with ideas of more Aristoteleian inspired theorists such as Johannes de Grocheio and Peter of Auvergne.

Tekla Bude starts from a simple premise--that music requires a body to perform it--to rethink the relationship between music, matter, and the body in the late medieval period. Sonic Bodies argues that writers thought of "music" and "the body" as mutually dependent and historically determined processes that called each other into being.

Eroticism in Early Modern Music contributes to a small but significant literature on music, sexuality, and sex in sixteenth- and seventeenth-century Europe. Its chapters have grown from a long dialogue between a group of scholars, who employ a variety of different approaches to the repertoire: musical and visual analysis; archival and cultural history; gender studies; philology; and performance. By confronting musical, literary, and visual sources with historically situated analyses, the book shows how erotic life and sensibilities were encoded in musical works. Eroticism in Early Modern Music will be of value to scholars and students of early modern European history and culture, and more widely to a readership interested in the history of eroticism and sexuality.

Musical notation is a powerful system of communication between musicians, using sophisticated symbolic, primarily non-verbal means to express musical events in visual symbols. Many musicians take the system for granted, having internalized it and their strategies for reading it and translating it into sound over long years of study and practice. This book traces the development of that system by combining chronological and thematic approaches to show the historical and musical context in which these developments took place. Simultaneously, the book considers the way in which this symbolic language communicates to those literate in it, discussing how its features facilitate or hinder fluent comprehension in the real-time environment of performance. Moreover, the topic of musical as opposed to notational innovation forms another thread of the treatment, as the author investigates instances where musical developments stimulated notational attributes, or notational innovations made practicable advances in musical style.