Question: What is the speciality of the English man who studies the French composer who wrote the motet "Illibata Dei virgo nutrix"?

full_context: Document 1: Janus Plousiadenos: Janus Plousiadenos (~1429-1500) was a 15th-century Greek Renaissance scholar, hymnographer and composer born in Crete. Plousiadenos was in favor of the Union of the Orthodox and Catholic Churches and wrote extensively on the subject. The 1455 "Defensio synodi Florentinae", often misattributed to Gennadius Scholarius is in fact his work. Plousiadenos was also an avid composer and hymnographer and dedicated several of his works to his friend and fellow Greek scholar Cardinal Bessarion. His sacred compositions for the Orthodox church use a discantus technique, thus achieving a polyphonic texture, a practice that underlines the innovative character of his works in regard to the usually considered as monophonic "byzantine chant" just before the fall of the Eastern Roman Empire.
Document 2: Early music: Early music is music, especially Western art music, composed prior to the Classical era. The term generally comprises Medieval music (500–1400) and Renaissance music (1400–1600), but can also include Baroque music (1600–1760), and, according to some authorities such as Kennedy (who excludes Baroque), Ancient music (before 500 AD). According to the UK's National Centre for Early Music, the term "early music" refers to both a repertory (European music written between 1250 and 1750 embracing Medieval, Renaissance and the Baroque) – and a historically informed approach to the performance of that music. However, today this term has come to include "any music for which a historically appropriate style of performance must be reconstructed on the basis of surviving scores, treatises, instruments and other contemporary evidence."
Document 3: David Conway (music historian): David Allen Conway (born 17 February 1950) is a British music historian. Born in London, and educated at Haberdashers' Aske's Boys' School, he studied economics and psychology as an undergraduate at King's College, Cambridge and later obtained a PhD degree under the supervision of John Klier at University College, London, where he has been since 2008 an Honorary Research Fellow. He is the brother of the journalist Barbara Conway (1952–1991).
Document 4: Jean Courtois (composer): Jean Courtois (fl. 15301545) was a composer of the Franco-Flemish School of the generation after Josquin des Prez. He was "maitre de chapelle" to the Archbishop of Cambrai in present-day France. His motet "Venite populi terrae" was written to celebrate Emperor Charles V and was performed in the Cathedral; the Emperor who would have heard it in 1539 on his march to suppress the Revolt of Ghent. He wrote 19 chansons, 14 motets, and 2 masses which have survived. Courtois’ work exhibits the varied imitative procedures and shifting textural treatment which typify the Franco-Netherlandish motet style. The chansons, for 4 voices, are in the "Parisian" style of the day; the works for 5 or 6 voices are in the more contrapuntal "Netherlandish" style.
Document 5: W. de Wycombe: W. de Wycombe (Wicumbe, and perhaps Whichbury) (late thirteenth century) was an English composer and copyist of the Medieval era. He was precentor of the priory of Leominster in Herefordshire. It is possible that he was the composer of the most famous tune from medieval England, "Sumer is icumen in".
Document 6: David Fallows: David Fallows (born 20 December 1945) is an English musicologist specializing in music of the late Middle Ages and Renaissance and the performance practice of music. He is a leader in fifteenth-century music studies, particularly Guillaume Dufay, Josquin des Prez, and secular song.
Document 7: Nicolas Jenson: Nicholas Jenson (c.1420 – 1480) was a French engraver, pioneer, printer and type designer who carried out most of his work in Venice, Italy. Jenson acted as Master of the French Royal Mint at Tours, and is credited with being the creator of one of the finest early Roman type faces. Nicholas Jenson has been something of an iconic figure among students of early printing since the nineteenth century when the aesthete William Morris praised the beauty and perfection of his roman font. Jenson is an important figure in the early history of printing and a pivotal force in the emergence of Venice as one of the first great centers of the printing press.
Document 8: Edward Paston: Edward Paston (1550–1630), second son of Sir Thomas Paston, was a Catholic gentleman of Norfolk, a poet, and amateur musician living in the reign of Elizabeth I. He is an important figure in the musical history of England, his love of music driving him to acquire and copy musical manuscripts from some of the most important composers of the Renaissance, resulting in a unique performing collection of 16th-century house music that included works by William Byrd, Thomas Tallis, John Taverner, and Orlando di Lasso. He was especially interested in Byrd, and one of his books is the largest source of consort songs by that composer. Paston played the lute, creating a wide range of vocal settings and accompanying tablatures in partbooks that are still obtainable. As a young man he travelled extensively in Spain, being influenced by the Spanish (and Italian) form of tablature, as seen in his partbooks, rather than the generally used French form.
Document 9: Vincent Gillespie: Vincent Gillespie (born 1954) is J.R.R. Tolkien Professor of Medieval Literature at the University of Oxford, editor of the Exeter Medieval Texts and Studies Series, and the director of the Early English Text Society. He is the author of "Looking in Holy Books", "Syon Abbey" (in the Corpus of British Medieval Library Catalogues), and the forthcoming "A Short History of Medieval English Mysticism". He is the co-editor, with Kantik Ghosh, of "After Arundel: Religious Writing in Fifteenth-Century England", with Susan Powell of "A Companion to the Early Printed Book in Britain, 1476-1558", with Samuel Fanous of "The Cambridge Companion to Medieval English Mysticism", and with Anne Hudson of "Probable Truth: Editing Medieval Texts from Britain in the Twenty-First Century". In 2003 he was elected a fellow of the Royal Historical Society; in 2013 he was elected a Fellow of the British Academy.
Document 10: David Nicholls (musicologist): David Nicholls (musicologist) (born in 1955, Birmingham, United Kingdom) is a British musicologist and composer. From 2000 through 2013 he was Professor of Music at the University of Southampton; subsequently he took early retirement and was awarded the title of Emeritus Professor of Music. From 1987 to 2000 he was Professor of Music and sometime Research Dean of the Faculty of Humanities at Keele University. Between 1984 until 1987 Nicholls was based at Selwyn College, Cambridge as a Keasbey Fellow in American Studies.
Document 11: David Downes (Irish composer): David Downes (born 9 June 1975) is a composer, pianist, producer, and musical director who is best known for being the co-founder and musical director of the all-female Irish ensemble Celtic Woman.
Document 12: Josquin des Prez: Josquin des Prez (] ; c. 1450/1455  – 27 August 1521), often referred to simply as Josquin, was a French composer of the Renaissance. His original name is sometimes given as Josquin Lebloitte and his later name is given under a wide variety of spellings in French, Italian, and Latin, including Iosquinus Pratensis and Iodocus a Prato . His motet "Illibata Dei virgo nutrix" includes an acrostic of his name, where he spelled it "Josquin des Prez". He was the most famous European composer between Guillaume Dufay and Giovanni Pierluigi da Palestrina, and is usually considered to be the central figure of the Franco-Flemish School. Josquin is widely considered by music scholars to be the first master of the high Renaissance style of polyphonic vocal music that was emerging during his lifetime.
Document 13: Jacopo Peri: Jacopo Peri (Zazzerino) (20 August 156112 August 1633) was an Italian composer and singer of the transitional period between the Renaissance and Baroque styles, and is often called the inventor of opera. He wrote the first work to be called an opera today, "Dafne" (around 1597), and also the first opera to have survived to the present day, "Euridice" (1600).
Document 14: Claudio Monteverdi: Claudio Giovanni Antonio Monteverdi (] ; 15 May 1567 (baptized) – 29 November 1643) was an Italian composer, string player and choirmaster. A composer of both secular and sacred music, and a pioneer in the development of opera, he is considered a crucial transitional figure between the Renaissance and the Baroque periods of music history.
Document 15: Josquin Des Pres (20th century musician): Josquin Des Pres (Born Josquin Turenne Des Pres) is a 20th-century French born American composer, bassist, author, producer, songwriter and most known for his contributions to music media books for Hal Leonard Corporation and Mel Bay instructional music books. Josquin has written a vast library of compositions and music techniques on bass, music studies and various collections which are used by music teachers, private studies and in schools both nationally and internationally as a standard tool in the music industry. Des Pres is also a collaborative writer with English lyricist, poet, and singer Bernie Taupin on several compositions. Josquin Des Pres also writes musical scores and music trailers for more than 40 major TV networks and television shows including The Ellen DeGeneres Show, The Bachelor (U.S. TV series), American Idol, The Tyra Banks Show, George Lopez (TV series), Anderson Cooper, TMZ on TV, Extra (TV program), American Chopper, Pawn Stars, Deadliest Catch, CNN, NBC, HGTV, TBS (U.S. TV channel), Bravo (U.S. TV network), Food Network, Animal Planet, Discovery Channel, History (U.S. TV channel), Travel Channel, CBS Television Stations, Viacom, VH1, ABC, BET, KPBS (TV), TLC (TV network), and The CW Network. His works are also known on MTV Networks Television Series Catfish, The Seven, When I Was Seventeen, MTV Cribs, Pimp My Ride, Teen Mom, True Life and 10 on Top.
ground_truth: English musicologist