Kullervo by Jean Sibelius (1865-1957):
About this piece, which is really not a symphony but rather a suite of tone poems based on Kullervo, a tragic figure in Finnish mythology. Avid readers of the works of J.R.R. Tolkien may recognize the tale of Kullervo.
Finlandia, perhaps Sibelius's most famous work:
Starting around time marker 6:10, some readers here will recognize the hymn "Be Still, My Soul."