As Hitler rose to power, the composers such as, Weill and Bartók had fled from Europe and went to the United states.
Bela Bartok, was an influential composer and was popular for recording and study of folklore of the indigenous people lived in Carpathian mountains.
Ethnomusicology, is a new branch of music which was came into light by his works of transcription, cataloguing and recording the folk music, and it now widely studied under social and cultural aspects.
He had to escape and fled out from Hungary because of his support to the Hungarian National movements. He protested against the anti-semitic laws, and the relationships with the Nazi Germany.
As, Hungary joined the Axis powers in November 1940, he fled out fron Hungary and went to U.S.A. .
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