Jersild learned how to play the piano at a young age and, when he was twelve, he arranged for the school orchestra and wrote some small compositions. He became a student of Rudolph Simonsen and later Poul Schierbeck, who taught him theory and composition, and Alexander Stoffregen, who gave him lessons on the piano. After a short stay in Paris in 1936 where he was taught for three months by Albert Roussel, he returned home and studied musicology at the University of Copenhagen. In 1940 he majored in musicology, but in 1939 he was employed as a program secretary with the DR, a national radio station in Denmark. In 1943 he became a teacher at The Royal Danish Academy of Music in Copenhagen, during which his music was reviewed by the Berlingske Tidende. From 1953 to 1975, he was professor and taught ear training, instrumentation and composition. During those years he published a number of theoretical and practical musical works. By 1930 he was engaged in the folkemusikskole movement, which encouraged the teaching of music and schools and the preservation of folk music. Together with Finn Savery, Finn Høffding and Jørgen Bentzon, he worked to spread musical knowledge and skills to children and adults, both in primary and secondary schools of music. In the years 1949–1953, he was chairman of the Danish Music Education Association.
Music
His output as a composer was not large, but included a large number of very well built choruses including 3 Madrigali, Trois piéces en concert for clavier, wind quintetPlaying in the woods and the musical adventure play Alice in Wonderland, based on the book by Lewis Carroll. From 1967 to 1977, he wrote 4 works which featured the harp. They were inspired by Benjamin Britten and were written for the harp player Osian Ellis. In addition, he wrote music for theater, radio, theater, film and even the winning song of the Dansk Melodi Grand Prix in 1965, For din skyld, with text of Poul Henningsen and sung by Birgit Brüel in the Eurovision. His music has been regarded as "French" or at least French-inspired - which can be translated as cultured and elegant. It is written in a clear and elegant modal style rooted in Neoclassicism. From interview in 1999: When asked, Jersild acknowledged that he was French-influenced he replies: "It may be true - all my starting points were French. It can be observed in the rate structure. If you hear Trois piéces en concert, it is not hard to hear that it is inspired by Ravel's Le Tombeau de Couperin. But it is still a bit more harmonious than Ravel. But I do not think it continued to be French. I think it's much more Danish now, but it may well be I am wrong. ' When asked about his position on Arnold Schoenberg and atonal music, Jersild stated: "... I think it's kind of putting things upside down to begin with theory and then make music. The music must beam of itself. And so it is perhaps sometimes a later generation given to work out technical, theoretical ideas. I find atonal music hard to follow, because I think that the results do not suggest that it is a good approach. " Upon receiving the, Nielsen Memorial Scholarship in 1999, Karl Aage Rasmussen, another composer, gave a speech that included following: "Jorgen Jersild's life's work is not comprehensive, and it is perhaps because his music is on the hunt for the particular simplicity and ease with no quick shortcuts to."
