The Peterhouse partbooks are a collection of English partbooks dating from the sixteenth and seventeenth centuries. They are named "Peterhouse" after Peterhouse in Cambridge, where the books were kept for some time, and are now preserved in the Cambridge University Library. They are handwritten manuscripts, all written on paper. At some point in the mid-eighteenth century, the books were rebound, although the foliation and indices remained unchanged.[1]