Jean Theslöf (25 June 1884 â 30 March 1966) was a Finnish sports shooter and singer. He competed in four events at the 1924 Summer Olympics. In 1925 Theslöf moved to the United States. He founded a singing school in New York and recorded almost 60 songs during his career. Theslöf sometimes recorded under the pseudonym "Muhoksen Janne."