Johannes Alanus ("fl.
" late 14th or early 15th century) was an English composer.
 He wrote the motet "Sub arturo plebs/Fons citharizancium/In omnem terram".
 Also attributed to him are the songs "Min frow, min frow" and "Min herze wil all zit frowen pflegen", both lieds, and "S'en vos por moy pitié ne truis", a virelai.
 "O amicus/Precursoris", attributed simply to "Johannes", may be the work of the same composer.
L'Opus Dei : enquête sur le "monstre" (English: Opus Dei: Inquiry into the "Monster") is a French-language journalistic and historical work of Patrice de Plunkett about Opus Dei, an institution of the Catholic Church.
 Plunkett was the editor of the French magazine "Le Figaro".
 His book was released on 17 May 2006, the debut of the film "The Da Vinci Code" which portrayed Opus Dei in a negative light.
 The purpose of the book is to inform the public about the Catholic Church, Christianity and Opus Dei, and to understand the black legend against Opus Dei.
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.
John Gross FRSL (12 March 1935 – 10 January 2011) was an eminent English man of letters.
 A leading intellectual, writer, anthologist, and critic "The Spectator" magazine called Gross "the best-read man in Britain", as did "The Guardian".
 He was the editor of "The Times Literary Supplement" from 1974 to 1981, senior book editor and book critic on the staff of "The New York Times" from 1983 to 1989, and theatre critic for "The Sunday Telegraph" from 1989 to 2005.
 He also worked as assistant editor on "Encounter" and as literary editor of "The New Statesman" and "Spectator" magazines.
Joseph Carey Merrick (5 August 1862 – 11 April 1890; often incorrectly called "John Merrick") was an English man with very severe deformities who was first exhibited at a freak show as the "Elephant Man", and then went to live at the London Hospital after he met Frederick Treves, so becoming well known in London society.
 Merrick was born in Leicester, and began to develop abnormally during the first few years of his life: his skin appeared thick and lumpy, he developed enlarged lips, and a bony lump grew on his forehead, one of his arms and both of his feet became enlarged and at some point during his childhood he fell and damaged his hip, resulting in permanent lameness.
 When he was 9, his mother died from bronchopneumonia, and his father soon remarried.
 Merrick left school at the age of 13 and had difficulty finding employment.
 Rejected by his father and stepmother, he left home.
 In late 1879, Merrick, aged 17, entered the Leicester Union Workhouse.
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.
Connotations is a classical music composition for symphony orchestra written by American composer Aaron Copland.
 Commissioned by Leonard Bernstein in 1962 to commemorate the opening of Philharmonic Hall (now David Geffen Hall at Lincoln Center for the Performing Arts) in New York City, United States, this piece marks a departure from Copland's populist period, which began with "El Salón México" in 1936 and includes the works he is most famous for such as "Appalachian Spring", "Lincoln Portrait" and "Rodeo".
 It represents a return to a more dissonant style of composition in which Copland wrote from the end of his studies with French pedagogue Nadia Boulanger and return from Europe in 1924 until the Great Depression.
 It was also Copland's first dodecaphonic work for orchestra, a style he had disparaged until he heard the music of French composer Pierre Boulez and adapted the method for himself in his "Piano Quartet" of 1950.
 While the composer had produced other orchestral works contemporary to "Connotations", it was his first purely symphonic work since his Third Symphony, written in 1947.
Pierre Robert (ca. 1618 – 30 December 1699) was a French composer and early master of the French "grand motet".
Theodore Edward Hook (22 September 1788 – 24 August 1841) was an English man of letters and composer and briefly a civil servant in Mauritius.
 He is best known for his practical jokes, particularly the Berners Street hoax in 1810.
 The world's first postcard was received by Hook in 1840, which he probably posted to himself.
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.

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