The popular What Makes It Great? with Rob Kapilow examines Benjamin Britten’s Christmas choral masterwork, “A Ceremony of Carols,” the last work produced during Britten’s U.S. residency from 1939-42. Join the “hyper-kinetic maestro” Kapilow, as he teams up with the renowned Voices Boston (formerly PALS Children’s Choir) to examine one of the masterworks of 20th-century choral music.