[2] After the Second World War, she established the town's Cecilia Society in 1945 and served as the head of NRK's junior orchestra from 1947 to 1951.
[1][3] Lagesen was often featured by NRK as a soloist with the Norwegian Radio Orchestra and she also appeared on TV abroad.
In 1977 she conducted Bach's Christmas Oratorio from Kongsberg Church in three programs on NRK Television.
After studying in Paris with Nadia Boulanger[1][2][3] and Eugène Bigot[2][6] from 1955 to 1957, with classmates Per Nørgård and Mikis Theodorakis,[2] she took a conducting exam and became a music teacher at Eik Normal School.
[7] As late as 1993, she lectured at the Norwegian Academy of Music on Edvard Grieg and his work for piano students.