For 10 points, name this nationalistic tone poem based on the Kalevala and composed by Jean Sibelius.
It was created to accompany selections from a poem called "The Melting of Ice on the Ulea River," and it initially bore the bland title "Impromptu" to avoid censorship from the Russians. Opening with a powerful brass fanfare, this piece centers around a hymn-like melody that went on to become its country's national anthem. For 10 points, name this nationalistic tone poem based on the Kalevala and composed by Jean Sibelius.
It was created to accompany selections from a poem called "The Melting of Ice on the Ulea River," and it initially bore the bland title "Impromptu" to avoid censorship from the Russians.
{Finlandia}