The Mercyhurst University Concert Choir, Carpe Diem Women and the Collegiate Quartet open their fall season with a concert on Sunday, Oct. 11, at 4 p.m. in Walker Recital Hall. Titled “Early Works and Beyond,” the a cappella program features works by Purcell, Palestrina, Monteverdi and Bach, as well as Buxtehude’s Missa Brevis. Rebecca Ryan directs. Tickets are $5, or $2 for Mercyhurst students and employees. Tickets will be available at the door, or call 814-824-3000.