St. Dunstan in the Eleventh through the Thirteenth Centuries: Transition within the Interaction of Texts and Music Margot Fassler, Keough-Hesburgh Professor of Music History and Liturgy, University of Notre Dame The five surviving medieval vitae of Dunstan of Canterbury were composed by an unknown Anglo-Saxon author (B); Adelard of Ghent; Osbern of Canterbury; Eadmer of Canterbury, and William of Malmesbury. In addition there is a twelvelesson historia, complete with transcribable music found in the early thirteenthcentury antiphoner Worcester 160, which was probably copied for the use of Worcester Cathedral. These rich materials provide a unique opportunity to think about the ways that musicians and hagiographers handled their materials over the course of nearly two centuries, and during a time that the most important and interesting music was being written for cults of the saints. A saint's cult in a particular place can offer a way into the processes musicians worked with, both as individuals, and within a communal context. This is especially true in England in the decades after the conquest when a significant group of cantor-historians worked on saints' cults at a time of transition from one political sphere to another. Political change of a significant magnitude meant that artistic and ecclesial expectations were in flux. The shifts that were taking place can be seen in the five vitae of Dunstan, and their authors' attitudes toward the saint and toward the making of history; these changes in their turn are embodied with the several layers discernable in the office chants. When the hagiographical and the musical materials are brought into close conversation, various kinds of carefully wrought interplay can be seen. I conclude that the framework for Dunstan's office was already established in late tenth and early eleventh century, probably through chants from an Anglo Saxon office that does not survive. After the conquest, Osbern of Canterbury's hand passed vigorously over inherited material, and it is he who most likely shaped the office chants that appear in Worcester 160. However, Eadmer of Canterbury, refined Osborn work on the chants, just as he did in the rewriting of Osbern's prose life of Dunstan. (Study of William of Malmesbury's life of Dunstan, on the other hand, reveals no influence on the office.) Further proof for the influence of Eadmer's work in Worcester is gleaned from Cotton Eton Ms. E 1, a passionale from Worchester. It contains the life of Dunstan in the version written by Eadmer of Canterbury.