The exquisitely decorated 15th century choir book known as the Old Hall manuscript was lost to history for the best part of 400 years until its reappearance in a Catholic seminary at the end of the 19th century. The largest surviving collection of medieval motets and mass movements, it immediately became the most celebrated source of English music of the period. It was written in the first instance by a single scribe to ensure that the music of his fellow singers was not forgotten. Many of them are known only from this manuscript, and on this album they find their voices again after more than half a millennium of silence, transformed by the singing of Trio Mediæval in the company of Catalina Vicens, alongside new music by David Lang and Marianne Reidarsdatter Eriksen. Hailed as a "fascinating journey with music of timeless beauty", Trio Mediæval’s highly acclaimed first album Words of the Angel in 2001 launched the group into the elite circles of early music ensembles and introduced them to a broad international audience. Formed in 1997, the Grammy nominated vocal ensemble consists of founder members Linn Andrea Fuglseth and Anna Maria Friman, and Jorunn Lovise Husan who joined the group in 2018. Trio Mediæval has recorded eight albums for ECM Records. An Old Hall Ladymass is their second release, following Solacium, with the Norwegian label 2L. Produced by Morten Lindberg.