Bela Bartok (1881-1945) was respected not only for his ability as a pianist (his teacher compared him to the greatest pianist of the 19th century) Franz Liszt (Fmnz Liszt, 1811-1886)], but because of his composition. His works preserve the tradition of Hungarian folk songs. Bartók studied and analyzed Hungarian, Roman and Arabic folk music. During his lifetime he published thousands of collections of these folk songs. National music also had an influence on other composers, but he was the first to combine them into a complete musical art combination. His unique folk music reveals the pure essence of music. His masterpieces include: The Wooden Prince and The Miraculous Mandarin, and the one-act opera Duke Bluebeard’s Castle. Music composition with folk music at its core has had a profound impact on the music industry. The work "Appalachian Spring" (Appalachian Spring; 1944) by American composer Aaron Copland (1900-1990) has this characteristic.