Jean Sibelius born Johan Julius Christian Sibelius was a Finnish composer of the late Romantic period, whose music played an important role in the formation of a Finnish national identity. The core of his ouvre is his set of seven symphonies, which reflect the development of his compositional style. In addition to those, his best known compositions include the symphonic poem Finlandia, the Karelia Suite, the Valse Triste, the Violin Concerto in D minor, and The Swan of Tuonela. His musical output includes nationalistic pieces, incidental music, more than a hundred songs, an opera, and choral music. After 1926, Sibelius ceased to work on large scale pieces: he instead re edited some of his earlier works, only ocassionally coming up with new music. Having paid off his debts and secured a state pension, he retired and lived a quiet life. He retained an active interest in new developments in music, although he did not always view modern music favorably. Sibelius is usually considered as an archetypal nationalist composer: his music had a strong role in the forging of a Finnish national identity. He was also a freemason (and he wrote a number of pieces to be used in Lodge ritual). The Finnish 100 mark bill featured Sibelius' image, and it was taken out of circulation when the Euro was adopted in Finland. Since 2011, Finland has celebrated a Flag Day on 8 December, the composer's birthday, also known as the 'Day of Finnish Music'.