Zoltán Kodály was a Hungarian composer of the Twentieth century who participated profoundly in the spread of music teaching in Hungary. Kodály has made a distinctive, flavourful, and less rhythmic romantic sound, drawn from the folk music of Hungary, from modern French music, and from the Italian Renaissance religious music. His works have been performed them extensively including "Psalmus Hungaricus (1923), written to celebrate the 50th anniversary of the union of Buda and Pest; Háry János (1926), a comic opera; two sets of Hungarian dances for orchestra, Marosszék Dances (1930) and Dances of Galánta (1933); a Te Deum (1936); a concerto for orchestra (1941); Missa Brevis (1942); an opera, Cinka Panna (1948); Symphony in C Major (1961); and chamber music, including two cello sonatas (1909–10; 1915), two string quartets (1908; 1916–17), and Serenade, for two violins and viola (1919–20)." In 1906 he wrote a thesis on Hungarian folk song, "Strophic Construction in Hungarian Folksong".