From The Library Of Congress:
“Comprises a group of field materials documenting Thomas Mann performing Anglo-American dance music on the hammered dulcimer collected for the Farm Security Administration in July, 1937 by Sidney Robertson Cowell in Ortonville, Iowa.”
http://memory.loc.gov/afc/afccc/audio/a382/a3820a3.mp3 Schottische played on the Hammered Dulcimer by Thomas Mann – July, 1937
You can hear several more recordings by clicking here!
Thanks to The Library of Congress!