Béla Bartók was a Hungarian composer, ethnomusicologist, and pianist, born on March 25, 1881. He is widely regarded as one of the most important composers of the 20th century. Bartók's music is known for its incorporation of folk elements, particularly from Hungarian and other Eastern European traditions, which he studied extensively. Throughout his career, Bartók created a diverse body of work, including orchestral pieces, chamber music, and piano compositions. His notable works include the Concerto for Orchestra and the Music for Strings, Percussion, and Celesta. Bartók's innovative use of rhythm and harmony has had a lasting influence on modern classical music. He passed away on September 26, 1945.