Edited by Roger Bray Both large-scale masses by Robert Fayrfax included in this volume are believed to be late works. O quam glorifica, in particular, was composed in 1511 for his supplication for the degree of Doctor of Music at Oxford, and in it the composer comprehensively explores the possibilities of extended structural planning. A feature of this edition is the restoration of the metrical character of the original, distorted in all surviving copies.