The Boston Cecilia, Michael Barrett, Music Director, presents its historic 150th season finale featuring commissioned premieres by composers Grace Coberly and Ashi Day, as well as pieces commissioned by Cecilia in the recent past, including Scott Wheeler's Turning Back for chorus, piano and mezzo-soprano soloist and works by Benjamin Perry and Nicholas White. Sat, May 16 at 7:30pm | All Saints Parish, Brookline Sun, May 17 at 3:00pm | Methuen Memorial Music Hall