This book presents together a number of path-breaking essays on different aspects of medieval music in France written by Manuel Pedro Ferreira, who is well known for his work on the medieval cantigas and Iberian liturgical sources. The first essay is a tour-de-force of detective work: an odd E-flat in two 16th-century antiphoners leads to the identification of a Gregorian responsory as a Gallican version of a seventh-century Hispanic melody. The second rediscovers a long-forgotten hypothesis concerning the microtonal character of some French 11th-century neumes. In the paper "Is it polyphony?" an even riskier hypothesis is arrived at: Do the origins of Aquitanian free organum lie on the instrumental accompaniment of newly composed devotional versus? The Cistercian attitude towards polyphonic singing, mirrored in musical sources kept in peripheral nunneries, is the subject of the following essay. The intellectual and sociological nature of the Parisian motet is the central concern of...