Joy, sorrow, and life’s ultimate mysteries combine in ethereal splendor as the 36 voices of the Ars Nova Singers present three great Requiem masses (a choral form that has attracted composers through the centuries as a vehicle for profound personal expression). Featuring Renaissance composer Jean Richafort’s Requiem for 6 Voices; Herbert Howells’ 1936 Requiem (considered such an intimate work that he withheld it from publication for 45 years); and Ildebrando Pizzetti’s Messa di Requiem, in which the composer weaves an intriguing twentieth-century web over ancient Gregorian melodies.