Baritone Vocals – Gordon Jones (tracks: 1, 3, 4, 7 to 9), Paul Hillier (tracks: 1, 3, 4, 7 to 9) Composed By – Perotin* (tracks: 1, 3, 5, 7, to 9) Countertenor Vocals – David James (tracks: 1, 2, 6 to 9) Design [Cover Design] – Barbara Wojirsch Directed By – Paul Hillier Engineer, Recording Supervisor – Peter Laenger Ensemble – The Hilliard Ensemble Liner Notes [English] – Paul Hillier Liner Notes [French Translation] – Danièle Robert Liner Notes [German Translation] – Regine Lienhard Producer – Manfred Eicher Tenor Vocals – Charles Daniels (tracks: 1, 7, 9), John Potter (tracks: 1 to 3, 5 to 9), Mark Padmore (tracks: 1, 3, 7 to 9), Rogers Covey-Crump