The term cantus firmus, particularly associated with medieval and Renaissance music, designates a pre-existing melody that is used as the basis for a new polyphonic composition. The In Nomine melody, taken from the Sarum antiphon Gloria tibi Trinitas, was used by nearly sixty English composers, from John Taverner to Henry Purcell, as the basis of over 150 works. Our program, In Nomine, samples this peculiarly mesmerizing repertoire from Elizabethan times through 1680.