Summary from Wikipedia

The core of his oeuvre is his set of seven symphonies, which, like his other major works, are regularly performed and recorded in Finland and countries around the world. His other best-known compositions are Finlandia, the Karelia Suite, Valse triste, the Violin Concerto, the choral symphony Kullervo, and The Swan of Tuonela (from the Lemminkäinen Suite). His other works include pieces inspired by nature, Nordic mythology, and the Finnish national epic, the Kalevala; over a hundred songs for voice and piano; incidental music for numerous plays; the one-act opera The Maiden in the Tower; chamb ...