All these works show great originality of form and content, a very interesting blend of highly sophisticated mastery of the western European style of music, including classical, late-romantic, impressionistic and modernist traditions, and on the other hand a profound knowledge and respect for the folk music of Hungary and the Hungarian-inhabited areas of Slovakia and Romania. Partly because of the Great War and subsequent major geopolitical changes in the region, and partly because of a naturally rather diffident temperament in youth, Kodály had no major public success until 1923. This was the year when one of his best-known pieces, Psalmus Hungaricus, was given its first performance at a concert to celebrate the fiftieth anniversary of the union of Buda and Pest (Bartók's Dance Suite premiered on the same occasion.)