Levin became a proponent of Norwegian music and culture while in exile in Sweden. He wrote the music to several patriotic Norwegian songs, including "Kirkenesmarsjen", a march to commemorate the liberation of the Northern Norwegian town of Kirkenes by Soviet troops on 25 October 1944. Sponsored by the Norwegian government-in-exile and Svenska Norgeshjälpen, Levin performed for members of the Norwegian Resistance Movement in Sweden along with his wife Solveig, Randi Heide Steen, Ernst Glaser, Gunnar Sønstevold, Hugo Kramm, Gunnar Reiss Andersen, Axel Kielland, Lauritz Falk, Sonja Mjøen, and others. Levin also sent packages to musical colleagues in Oslo under the pseudonym "Banjo-Lasse".