One of the two choirs performing at Prince William and Kate Middleton's wedding, the other being The Chapel Royal Choir. During the wedding service, both choirs will be given direction from James O'Donnell, Organist and Master of the Choristers at Westminster Abbey.

The Choir of Westminster Abbey is comprised of 20 boys and 12 adults. The boys are all students of the Choir School; the adults are part of a group known as Lay Vicars. The Choir of Westminster Abbey sings at daily choral services in the Abbey, as well as playing at royal, state, and national events.