This mass on a plainchant cantus firmus from the feast of the Nativity of the Blessed Virgin is one of the few works by Fayrfax for which some external dating evidence survives: it is probably the mass of the same name of which a copy was made for King's College, Cambridge, in 1503/4. For five voices: SATBarB. 2024. xiv + 50 pages. ISMN 979-0-57039-213-1.
