La Trobe University - Library: Medieval Music Database - Annual cycle of feasts of liturgical chant, liturgical polyphony and secular music of the late middle ages.

[Alleluia confessoris almi presentia] ... reddit choro consona vox

monophonic anonymous motet

Wölfenbüttel: Herzog-August Bibliothek 499 (W3), fol. 2v (1/1) (Triplum only).

LEFFERTS, Peter M. The Motet in England in the Fourteenth Century, Ann Arbor: UMI Research Press, 1986, p. 303.