His solo debut as a violinist took place during November 1933 in the Ceremony Hall of the
University of Oslo (
Universitetets Aula). In 1938, he was appointed concertmaster of the
Bergen Philharmonic Orchestra where he stayed for two years. During World War II, he taught at the Barratt Dues Music Institute which had been founded and was operated by his wife's parents, Mary Louise Barratt Due (1888–1969) and Henrik Adam Due (1891-1966). On 20 February 1944, Flame was aboard the ferry D/F Hydro when it was sunk in a commando operation. The Hydro was carrying heavy water that would have been used in Nazi Germany's nuclear weapons programme. In 1945, Fladmoe made his debut as conductor of the
National Theatre in Oslo and continued until there until 1959, except for the 1947–48 seasons where he was conductor of the
Trondheim Symphony Orchestra. He conducted both the
Oslo Philharmonic Orchestra and the
Bergen Philharmonic Orchestra and was principal conductor in Bergen from 1958 until 1961. He was the first musical director at the
Norwegian National Opera from 1961 to 1973. He also served as professor at
Norwegian Academy of Music. Arvid Fladmoe wrote numerous compositions for voice, for orchestra and several chamber works. In 1966, Fladmoe was made a Knight first Class of the
Royal Norwegian Order of St. Olav. In 1973, he also received the
King's Medal of Merit in gold. ==Works==