1961 reissue of the 1950 Folkways Records, ‘Ethnic Folkways Library’ release of Bela Bartok’s field recordings of the folk music of Hungary.
https://folkways.si.edu/folk-music-of-hungary/world/music/album/smithsonian
https://www.npr.org/templates/story/story.php?storyId=14416746
https://arbiterrecords.org/bartok-exploring-transylvania/
https://www.npr.org/2009/05/06/103733863/bartok-from-the-fields-to-the-concert-hall
https://www.cpr.org/2016/03/29/listen-how-bela-bartok-turned-folk-melodies-into-classical-masterworks/
https://stringsmagazine.com/how-bela-bartok-redefined-classical-music/