On their fifth release on ECM New Series, and their first in four years, Oslo’s Trio Mediaeval have chosen a work from the thirteenth century, a reconstruction of a votive Mass to the Virgin Mary, based on manuscripts and fragments originating in an English Benedictine Abbey. The original manuscripts were missing a Credo and a Benedicamus Domino, so the trio invited English composer Gavin Bryars to compose the appropriate settings, which sit very well with the mediaeval originals. This is a stunningly beautiful performance from this brilliant trio.