Title: Opus est
Subjects: History and criticism, Composers, Orchestral music, Biography, Music
Places: Northern Europe
People: Fartein Valen (1887-1952), Matthijs Vermeulen (1888-1967), Allan Pettersson (1911-), Vagn Holmboe (1909-1996), Kaikhosru Shapurji Sorabji (1895-1988), Brian Havergal (1876-1972)
Time periods: 20th century