For 10 points, name this nationalistic composer of Finlandia.
The harmonies of this composer's fourth symphony center on the repeated tritones. In one work by this composer, an English horn depicts a bird swimming around the island of the dead; that work, "The Swan of Tuonela," is grouped with three other works by this composer based on the Kalevala. This composer of the Lemminkainen Suite also wrote a symphonic poem against Russians that includes a patriotic hymn. For 10 points, name this nationalistic composer of Finlandia.
The harmonies of this composer's fourth symphony center on the repeated tritones.
Jean {Sibelius}