50th Anniversary Season Conclusion. The Back Bay Chorale celebrates the conclusion of its 50th Anniversary Season with a once-in-a-generation event. O Fortuna: A Carmina Burana Spectacular brings Carl Orff's exhilarating masterwork to life in a bold multidisciplinary production. In an unprecedented collaboration with Boston Conservatory at Berklee, this performance unites the Chorale with the Conservatory's orchestra, choirs, and dance division for an extraordinary presentation of one of the most iconic works in the choral canon.