1989 0-88946-429-4 Essays dealing with music as it was understood, visualized, articulated, and interpreted in the Middle Ages. Argues that medieval discussions of music depended on a structural foundation which writers were certain that their readers possessed, and this influenced the subject matter of music.
1990 0-88946-267-4 Deals with patterns of medieval thought and their applications in several disciplines, among them algebra, music, aesthetics, and philosophy.