In the 1960’s Lars worked as a label manager and the main artist on that label was the band Hep Stars, in which Benny Andersson from ABBA started his songwriting career. In the early 1970s Lars worked as a studio musician (bass player) together with numerous Swedish artists and bands. He also worked as a musician for the famous film director Ingmar Bergman.
Lars has (co-)written around 2.500 songs. Some 700 of them were recorded by artists from Sweden. A few of his songs were written for international artists in the USA, Canada, Australia, New Zeeland, Germany, Austria, Switzerland, Denmark, Norway and Finland. His songs were also used in various Hollywood movies.