The Worcester Fragments comprise 25 short pieces of vocal music. They are referred to as "fragments" because they do not exist in one unified manuscript but have been reassembled from sheets used as book-binding material in later centuries. These old materials had themselves at some stage been bundled together into several collections of flyleaves and saved in various books which had historical connections with Worcester. Once it was recognised that these scattered fragments came from the same source it was possible to piece them together, though much remained missing.
The pieces are from the late 13th century to early 14th century. None of them is longer than five minutes, with some as short as one minute long. They demonstrate a variety of musical forms from the period, including the conductus and motet. Parts of several polyphonic compositions attributed to Willelmus de Winchecumbe are included in the Worcester Fragments.