This is the thirtieth video of the "Do you know composers well" project.
Correct answer:
JEAN SIBELIUS
Jean Sibelius (1865 - 1957) was a Finnish composer of the late Romantic and early-modern periods. He is widely regarded as his country's greatest composer, and his music is often credited with having helped Finland develop a stronger national identity when his country was struggling from several attempts at Russification in the late 19th century.
Sounded like:
VALSE TRISTE