The Mulliner Book (British Library Additional Manuscript 30513[a]) is a historically important musical commonplace book compiled, probably between about 1545 and 1570, by Thomas Mulliner, about whom practically nothing is known, except that he figures in 1563 as modulator organorum (organist) of Corpus Christi College, Oxford. He is believed to have previously resided in London, where John Heywood inscribed the title page of the manuscript Sum liber thomas mullineri / iohanne heywoode teste. A later annotation on the same page states that: T. Mulliner was Master of St Pauls school, but this has so far proved unsupportable. The provenance of the MS is unknown before it appears in the library of John Stafford Smith in 1776. After passing through the hands of Edward Francis Rimbault the MS was given to the British Museum in 1877 by William Hayman Cummings.
^The book is described as: Paper; late Henry VIII. Oblong octavo. In the original binding, stamped with Tudor rose, portcullis and fleur-de-lys, and the initials H[enricus] R[ex] [note: these initials are now thought to be those of the binder]. Collection of compositions apparently arranged for organ and virginals, on two staves of from 5 to 8 lines each, or a single stave of from 11 to 13 lines. Probably in the hand of Thomas Mulliner, Master of the Choir of St. Paul's Cathedral, who appears to have been the original owner of the MS, as testified by John Heywood (virginal player to Edward VI) and who is evidently the T.M. mentioned.