Collegiate a cappella, part of a long tradition of unaccompanied singing, is known to date back on American college campuses to at least the colonial era. Considered in the context of college glee clubs, barbershop quartets, early-twentieth-century vocal pop groups, doo-wop groups, and contemporary a cappella manifestations in pop music, collegiate a cappella is an extension of a very old tradition of close harmony singing---one that includes but...