Gustav Lorentzen (28 September 1947 – 21 April 2010) was a Norwegian singer-songwriter, best known from being half of the successful duo Knutsen & Ludvigsen, alongside Øystein "Knutsen" Dolmen. He went solo in 1986, winning four Spellemann awards and one nomination for his 5 albums. In addition to music, Lorentzen has made several TV series and books, mostly intended for children. He also has a degree in acoustics from the Norwegian Institute of Technology.

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