Forrest-Heyther partbooks

The Forrest-Heyther partbooks (Oxford, Bodleian Library MS. Mus. Sch. e. 376–381) are a set of six manuscript partbooks copied in England in the sixteenth century. They are an important source of polyphonic Mass Ordinary settings by composers from the reign of Henry VIII, including John Taverner and Robert Fayrfax.