Who was Bela Bartok and what were some of his famous musical compositions and innovations?

Bela Bartok was a Hungarian composer, pianist, and ethnomusicologist born in 1881. He is considered one of the most important composers of the 20th century and is known for his contributions to the field of music theory, particularly his work in the area of ethnomusicology.

One of Bartok's most famous works is his 'Concerto for Orchestra,' which was commissioned by the Boston Symphony Orchestra in 1943. It is considered one of his most important compositions and is known for its innovative use of orchestration and its incorporation of Hungarian folk melodies.

Another one of Bartok's famous compositions is his 'Music for Strings, Percussion and Celesta.' This piece is known for its unique instrumentation and use of contrasting rhythms, as well as its incorporation of traditional Hungarian melodies.

In addition to his musical compositions, Bartok was also known for his work in the field of ethnomusicology. He was particularly interested in the music of Eastern Europe and spent many years collecting and studying traditional Hungarian folk songs. His research in this area had a significant impact on the development of modern music theory and composition.