The Critical Nexus is a milestone in every respect, which appeals to specialists and novices alike. It deserves to be ranked among the classic studies on the subject and will be of lasting value to anybody interested in the formation of music thought in the Middle Ages. Fontes Artis Musicae The Critical Nexus will become required reading for musicologists, music theorists, and medievalists interested in the reception of ancient texts. Speculum A meticulously researched survey of early medieval theory and its application to plainsong, it will form the starting point for future research in the field. James Grier, Professor of Music History, University of Western Ontario A comprehensive study, fine-tuning our understanding of the challenges faced by medieval theorists as they adopted terminology and concepts from Antiquity to make sense of the music of their own time - the chant repertory of the Christian church. Professor Atkinson brings a unique perspective to this history of tone-system, mode, and not...