 Of his compositions include "Oratorio King Olav" (1930), the operas "Olav Liljekrans" (lyrics by Ibsen, 1931–1940) and "Cymbelin" (lyrics by Shakespeare, 1943–1950), premiered in 1951, with Aase Nordmo Løvberg in the role of Imogen, the choral "Mjøsen" (mixed choir with piano, 1922), the melodrama "Liti Kersti", "Cantata to Drammens 100th anniversary" (soli, choir and orchestra), music to "Liti Kjersti" (1915), "Symphony in G minor" (1920), 2 violin sonatas, cello sonatas, organ works (Ciaconna) and a numerous romances.Stylistically Eggen continued Grieg and Svendsen's national romantic line, and he has been particularly known for his great ability to create beautiful melodies.He died at Bærum Hospital.