A Discantus partbook from a set of five volumes; 4 are part of M91, the Altus is in England (GB-SC Recusant Library, R0279, RFF3). Copied by the same scribe as BolC Q21 (Mitchell Brauner); this copyist was probably Gianpiero Masacone, who wrote FlorD 4, 11, 27, and 28 (Rifkin).
The sixty compositions are copied in three series: 14 four-voiced motets; 16 five- and six-voiced motets; and 30 four-, five- and six-voiced madrigals.
Copied in Florence; presented to Henry VIII of England, apparently as a gift from the city of Florence. In the early 17th century, the books were in the possession of the Catholic recusant Francis Tregian the Younger (1574-1619), who copied a madrigal from them into LonBLE 3665, and a motet into NYorkP 4302. Nothing is known of the subsequent history of the books until the 19th century.
At some point, the Altus became separated from the rest of the books; it had already passed into other hands by the time the remaining books of the set were acquired, late in the 19th century, by the singer and organist William Hayman Cummings (1831-1915). Two years after Cummings' death, the books were purchased at auction by the book dealer Bernard Quaritch. Quaritch listed the books for sale in 1919, 1931, and again in 1935, at which time they were purchased by the Newberry Library. (On the rediscovered Altus book, see SlimRT and the entry for SuttonO 4.)