|Image from Le Wik|
Jean Sibelius was part of the late nineteenth century movement of nationalist composers (broadly including Greig, Dvořák, and even Vaughan Williams). Sibeliuswas perhaps the most influential of all in helping to crystalize a national identity as Finland struggled for independence from Russia.
Finlandia is without doubt his most recognizable piece. It premiered in 1899, in the middle of a career than would best be described at the time as "sleeper". His reputation grew to the point where in the 1920s he simply stopped composing. His last thirty years were known as "The Silence of Järvenpää" where his house was).