Finals are here, and what better way to de-stress than with a medley of pop songs performed by some of Boston University’s best a cappella groups? A cappella, which means “in the manner of the chapel,” is a term first used to describe church music composed for unaccompanied voices, and now refers to any vocal music performed without instruments.

BU Today showcases a different group each day this week. All performances were taped at the Castle.

In our final installment, watch performances by the Dear Abbeys and the Barbershop Sweethearts.