This volume belatedly commemorates the centenary of 1988 and is of considerable interest and value in its own right. The commemorative volume is a worthy signal that despite changing times there is life yet in the Society and its adherents. As will be seen, several at least of these essays are destined to rank as important contributions to the literature for many years to come, not least because the volume, magnificently prited, is furnished with a very full triple index of manuscript sources, of incipits and titles, and of names.

1. David Hiley: The Plainsong and Mediaeval Music Society, 1888-1988; I. Liturgy and Liturgical Poyphony in Early Medieval England; 2. Ritva Jacobsson: Unica in the Cotton Caligula Troper; 3. Michel Huglo: Remarks on the Aleluia and Responsory Series in the Winchester Troper; 4. David Hiley: Post-Pentecost Alleluias in Medieval British Liturgies; 5. Susan Rankin: Winchester Polyphony: The Early Theory and Practice of Organum; 6. Wulf Arlt: Stylistic Layers in Eleventh-Century Polyphony: How can the Continental Sources Contribute to our Understanding of the Winchester Organum?; II. Liturgy and Liturgical Polyphony in Later Medieval England; 7. Ruth Steiner: Marian Antiphons at Cluny and Lewes; 8. David Chadd: An English Noted Breviary of circa 1200; 9. Andrew Hughes: British Rhymed Offices: A Catologue and Commentary; 10. John Caldwell: Relations between Liturgical and Vernacular Music in Medieval England; 11. Frank Ll. Harrison: Plainsong into Polyphony: Repertories and Structures circa 1270-circa 1420; 12. Nick Sandon: The Manuscript London, British Library Harley 1709; Index