The Mercyhurst University Concert Choir, under the direction of Rebecca Ryan, will perform at Saint Peter Cathedral on Nov. 13 as part of the cathedral's Concert Series. The choir will sing both a cappella and accompanied, with a repertoire ranging from the Renaissance to the present. The program will feature quartets, 17 participants in the Pennsylvania Collegiate Choral Association Festival, the Carpe Diem Women small ensemble, and student conductors. The concert is free and open to the public. Call 814-824-2394 for more information.