The plainchant Nigra sum is followed by a motet from Jean Lhéritier that is based on the same melody and then by Palestrina's parody Mass based on the Lhéritier motet. The album concludes with motets by Victoria and De Silva that are also based on the same plainchant melody. This analogue recording made in 1983 in the Chapel of Merton College is an excellent example of The Tallis Scholars innovative programming.