This collection of essays celebrates the work of the Plainsong and Mediaeval Music society and was written in particular to celebrate their centenary. Founded in 1888, the Society quickly established two areas of activity: to propagate information on medieval music and to revitalize the Anglican liturgy with the riches of the plainchant of the Roman Rite. Focusing on the scholarly side of the society's activities, the essays reflect the founders' interest in medieval music, both monophonic and polyphonic, and, particularly, their concern with chant. The contributors are among the most distinguished scholars of medieval music of recent years. Their essays are complemented by many music examples and a number of line drawings.