A study of the music and ritual at Saint-Denis from the sixth to the sixteenth century, this book is based on an examination of the liturgical books and archival sources relating to the abbey, in particular the surviving service-books, which tell us much about the history of the music and of the Divine Office at Saint-Denis. Robertson also looks at the tropes and sequences proper to the office for Saint Denis, provides information on the performance practices, instruments, musicians, and liturgists from the abbey, and offers an account of the history of the liturgy from the Council of Torus...