Lasse Mårtenson was born on September 24, 1934 in Helsinki, Finland as Lars Anders Fredrik Mårtenson. He was a composer, known for Harjunpää ja kiusantekijät (1993), Mustaa valkoisella (1968) and Lasse Mårtenson - laulaja (1967). He was married to Sari Angervo, Anna-Liisa Ehrnrooth, Siw Malmkvist and Carita Wilhelmsson.