Judith Weir 'S Ave Regina Caelorum For Unaccompanied Choir Ssatbb. This Piece Was Commissioned By Merton College, Oxford As Part Of The Merton Choirbook, A Collection Of Music Being Assembled To Celebrate Merton College'S 750Th Anniversary In 2014. Ave Regina Caelorum Was First Performed On 8Th July 2014 In Gloucester Cathedral, As Part Of The Cheltenham Music Festival, By The Choir Of Merton College Conducted By Benjamin Nicholas.