Not long after, Larsen joined the group The Stringers. He succeeded Helge Nilsen, who soon rejoined. Larsen started working as a journalist in "Bergens Arbeiderblad" in 1967. He came to refer to himself as a Christian socialist. He became involved in the YMCA in 1968, and was a devout Christian from 1969. He did not leave music as he founded a choir in Bergen named Gospel. In July in the same year he also married nurse Edle Tornes, born 1947. Gospel released LPs in 1970 and 1972. With the choir, Larsen made his debut as a television presenter in 1970, in the Norwegian Broadcasting Corporation show "Gospel synger gospels". In 1972, Larsen formed the gospel group "Frisk Luft" together with Kjell Fjalsett, Ivar Skippervold and Arnold Børud. The group formed by coincidence in 1972, when Larsen and Børud, performing at Hedmarktoppen, spotted the already-known Fjalsett and Skippervold in the audience and invited them onto the stage. "Frisk Luft" released two LPs in the 1970s, and participated in a television show named "Gospelkveld". It was said to be the first Christian supergroup in Norway. Larsen's third television show aired from 1975, and was "Hele menigheten synger", a copy of the Swedish "Hela kyrkan sjunger". Songs from the show were released on LP and sold well. Larsen had left the journalist job to become secretary for the YMCA in Trondheim from 1974. He held the same job in Bergen from 1976 to 1978 before returning to journalism, working in "Bergens Tidende" from 1978 to 1981. He still performed sporadically, trying himself in the national Melodi Grand Prix event with the song "Robåtrock" in 1977. In 1981, he founded the record company Noah. He also released the album "Sweet Mints" together with Helge Nilsen, under the name Helge & Rune. The album was produced by Trygve Thue of the band Saft. Several releases followed. In 1983 Larsen discovered later world-famous singer Sissel Kyrkjebø via the television show "Syng med oss" presented by Nils Abrahamsen. Her first three records ("Sissel", "Glade jul", "Soria Moria") were released on Noah.