Borge appeared on "Toast of the Town" hosted by Ed Sullivan several times during 1948. He became a naturalized citizen of the United States the same year. He started the "Comedy in Music " show at John Golden Theatre in New York City on 2 October 1953. "Comedy in Music" became the longest running one-man show in the history of theater with 849 performances when it closed on 21 January 1956, a feat which placed it in the "Guinness Book of World Records".