Katelyn will join Chicago a cappella singing this program, co-created and narrated by Deke Sharon, the heralded “Father of Contemporary A Cappella” and music director of “Pitch Perfect,” The History of Harmony is the story of vocal harmony from the early 20th century to today. From barbershop quartets through doo-wop and boy bands, these layered musical sounds have permeated pop music and our entire culture. Tickets and more info.