The Monster Thursday soundtrack is by Nils Erga. Erga first worked with Arild Østin Ommundsen on the short film Hjemsøkt. Monster Thursday is the first feature film soundtrack he has produced with Thomas Dybdal. Erga plays in the group Noxagt, which just released its second album, "The Iron Point". The album has received rave reviews both at home and abroad. Two songs from this album can be heard in the film, Svarte-vatn and Acasta gneiss.