An important set of partbooks now belonging to Peterhouse, Cambridge (Peterhouse MSS 471–474) was probably copied in about 1540, mainly from the repertory of Magdalen College, Oxford, for use at Canterbury Cathedral. The books contain over seventy Latin sacred compositions in five voices, chiefly by English composers of Taverner’s generation; some fifty of these works are not otherwise known. Unfortunately the tenor book and some leaves from the treble book are lost, rendering the unique compositions incomplete. Antico Edition is publishing, in forty volumes (RCM101–140), all the compositions unique to the Peterhouse collection, in editions by Nick Sandon in which the missing voices have been recomposed. An important repertory of high-quality music by composers such as Taverner, Fayrfax, Aston, Ludford, Jones and Pygott will thus be made available for practical and scholarly use, throwing fresh light on a crucial period of transition in English musical history. The series has already aroused considerable interest both in Europe and in the United States.