Béla Viktor János Bartók ( ; ] ; 25 March 1881 – 26 September 1945) was a Hungarian composer, pianist and an ethnomusicologist.
 He is considered one of the most important composers of the 20th century; he and Liszt are regarded as Hungary's greatest composers .
 Through his collection and analytical study of folk music, he was one of the founders of comparative musicology, which later became ethnomusicology.
Anthony Francis Aveni (born 1938) is an American academic anthropologist, astronomer, and author, noted in particular for his extensive publications and leading contributions to the field of archaeoastronomy.
 With an academic career spanning over four decades, Aveni is recognized for his influence on the development of archaeoastronomy as a discipline in the latter 20th century.
 He has specialized in the study of ancient astronomical practices in the Americas, and is one of the founders of research into the historical astronomy of pre-Columbian Mesoamerican cultures.
 s of 2009 Aveni holds an endowed chair as the Russell Colgate Distinguished University Professor of Astronomy and Anthropology and Native American Studies at Colgate University in Hamilton, New York.
 With his artist wife Lorraine, he currently resides in Hamilton, New York.
Theodor Puschmann (4 May 1844 – 28 September 1899) was a German psychiatrist and one of the founders of the history of medicine as a discipline.
 His "diagnosis" of Richard Wagner's supposed mental illness was a significant contribution to the idea of degenerate music.
Héctor Xavier (1921 – July 3, 1994) was one of Mexico's most important sketch artists of the 20th century.
 Part of the Generación de la Ruptura, Xavier was one of the founders of the Prisse Gallery, which helped to break the hold that Mexican muralism artists had on the market in Mexico.
 He had his first exhibition, of paintings, in the late 1940s, but it was criticized as showing lack of drawing technique, this prompted Xavier to practice the discipline for nine hours a day and becoming specialized in it.
 However, he felt closer to writers and journalists than to other artists, with his work published in newspapers, magazines and books, rather than exhibited in Mexico via art shows.
 Except for acceptance into the Salón de la Plástica Mexicana, he was disconnected from the art scene for much of his career and did not believe in donating his works to museums or other art institutions.
 For these reasons, there are no major collections of his work and much of it is lost.
Johann Joachim Winckelmann (9 December 1717 – 8 June 1768) was a German art historian and archaeologist.
 He was a pioneering Hellenist who first articulated the difference between Greek, Greco-Roman and Roman art.
 "The prophet and founding hero of modern archaeology", Winckelmann was one of the founders of scientific archaeology and first applied the categories of style on a large, systematic basis to the history of art.
 Many consider him the father of the discipline of art history.
 His would be the decisive influence on the rise of the neoclassical movement during the late 18th century.
 His writings influenced not only a new science of archaeology and art history but Western painting, sculpture, literature and even philosophy.
 Winckelmann's "History of Ancient Art" (1764) was one of the first books written in German to become a classic of European literature.
 He was one of the first to separate Greek Art into to periods, and time classifications.
 His subsequent influence on Lessing, Herder, Goethe, Hölderlin, Heine, Nietzsche, George, and Spengler has been provocatively called "the Tyranny of Greece over Germany."
Renato Poggioli (Florence April 16, 1907 – May 3, 1963), was an Italian academic specializing in comparative literature living in the United States.
 At the time of his death, he was the Curt Hugo Reisinger Professor of Slavic and Comparative Literature at Harvard University.
 A prolific writer and translator, who was fluent in five languages, he is considered one of the founders of the academic discipline of comparative literature in the United States.
Alexander Dobrokhotov is a Russian philosopher, historian of philosophy, historian of culture, and university professor.
 He specialises in the history of Russian culture, history of philosophy, metaphysics, Russian philosophy, ancient and medieval philosophy, Kant and German Idealism, and philosophy of culture.
 Alexander Dobrokhotov is a leading Russian philosopher of culture and one of the founders of the Russian discipline within the humanities called ‘culturology’ (kulturologia).
Walter Isard (April 19, 1919, Philadelphia – November 6, 2010, Drexel Hill, Pennsylvania) was a prominent American economist, the principal founder of the discipline of Regional Science, as well as one of the main founders of the discipline of Peace Science and Peace Economics.
Psalmus Hungaricus, Op. 13, is a choral work for tenor, chorus and orchestra by Zoltán Kodály, composed in 1923.
 The Psalmus was commissioned to celebrate the fiftieth anniversary of the unification of Buda and Pest, and Óbuda for a gala performance on 19 November 1923 along with the "Dance Suite" by Béla Bartók, and the "Festival Overture" by Ernő Dohnányi, who conducted the concert.
 The work's first performance outside Hungary took place under Volkmar Andreae in Zurich on 18 June 1926.
 This marked a turning-point in the international recognition of Kodály as a composer, beyond his renown as an ethnomusicologist and music educator.
Thomas Christian Wyller (16 September 1922 – 24 April 2012) was a professor of political science at the University of Oslo.
 He is regarded as one of the founders of political science as an academic discipline in Norway, and his area of interest is modern political history.

Question:  Psalmus Hungaricus was commissioned by one of the founders of which musical discipline?
Answer: ethnomusicology