Two months ago, when I arrived at Duke for the first time as a student for First-Year Orientation, the concept of a “Christian a cappella group” on a college campus was unfamiliar to me. I lacked imagination — in my mind, generic college a cappella groups were composed of friends who sang songs sometimes. Sure, each group might perform different music and have different people, but their purpose — to sing— was the same. But Something Borrowed Something Blue called itself a “C