Paul Ludvig Irgens-Jensen (13 April 1894 – 11 April 1969) was a Norwegian twentieth-century composer.Irgens-Jensen studied piano with Nils Larsen while a philology student at the University of Oslo. He began composing in 1920, and the radical nature of his work attracted some interest. Irgens-Jensen's oratorio Heimferd (for solo choir and orchestra) won first prize in a national competition, and is considered a national monument of sorts for Norway. The song Altar is one of his most familiar works.During the Second World War, Irgens-Jensen composed several songs and orchestral works to patriotic texts; due to the restrictions imposed by the Nazis, these works had to be distributed anonymously and illegally. Irgens-Jensen is often characterized as a neo-Classical composer.