This book is a study of the programmatic oral performance of the written word and its impact on art and text. Communal singing and reading of the Latin texts that formed the core of Christian ritual and belief consumed many hours of the Benedictine monk's day. These texts-read and sung out loud, memorized, and copied into manuscripts-were often illustrated by the very same monks who participated in the choir liturgy. The meaning of these illustrations sometimes only becomes clear when they are read in the context of the texts these monks heard read. The earliest manuscripts of Citeaux, copied and illuminated at the same time that the new monastery's liturgy was being reformed, demonstrate the transformation of aural experience to visual and textual legacy.