for SSAATTBB unaccompanied This exciting concert piece sets Latin words from the mass orders of the Catholic Church and the Book of Isaiah to form a versatile text that is suitable for both Christmas and for general use throughout the year. The choral divisi and additional solo lines give a deep richness to the sound in the sustained passages, which contrast with a lively and robust central section featuring catchy syncopations, before a majestic closing Amen.