Question: Which group was the focus of the 2017 National Recording Registry musician with the recorded work Folk Songs of the Hills ?

text: National Recording Registry
2017
On March 21 , 2018 , the following 25 selections were announced . [ 49 ] The Ink Spots , a popular African-American vocal jazz group during the 1930s-1940s Gloria Estefan brought a Cuban flavor to the top on the charts during the 1980s with her band Miami Sound Machine . Yo-Yo Ma , an acclaimed Grammy Award-winning celloist , performed works by various composers from Tan Dun ( of Crouching Tiger , Hidden Dragon fame ) to tango composer Astor Piazzolla .
The National Recording Registry is a list of sound recordings that are culturally, historically, or aesthetically important, and/or inform or reflect life in the United States. The registry was established by the National Recording Preservation Act of 2000, which created the National Recording Preservation Board, whose members are appointed by the Librarian of Congress. The recordings preserved in the United States National Recording Registry form a registry of recordings selected yearly by the National Recording Preservation Board for preservation in the Library of Congress. The National Recording Preservation Act of 2000 established a national program to guard America's sound recording heritage. The Act created the National Recording Registry, The National Recording Preservation Board and a fund-raising foundation. The purpose of the Registry is to maintain and preserve sound recordings and collections of sound recordings that are culturally, historically, or aesthetically significant. Beginning in 2002, the National Recording Preservation Board has selected recordings nominated each year to be preserved. The first four yearly lists each had 50 selections. Since 2006, 25 recordings have been selected annually. As of 2018[update], a total of 525 recordings have been preserved in the Registry. Each calendar year, public nominations are accepted for inclusion in that year's list of selections, which are announced the following spring. Each yearly list typically includes a few recordings that have also been selected for inclusion in the holdings of the National Archives' audiovisual collection.
Recording or collection Performer or agent Year
Dream Melody Intermezzo : Naughty Marietta Victor Herbert and his Orchestra 1911
Standing Rock Preservation Recordings George Herzog and Members of the Yanktoni Tribe 1928
Lamento Borincano written by Rafael Hernández Marín performed by Canario y Su Grupo ( including Davilita on lead vocals ) 1930
Sitting on Top of the World Mississippi Sheiks 1930
The Complete Beethoven Piano Sonatas Artur Schnabel 1932-1935
If I Did n't Care The Ink Spots 1939
Proceedings of the United Nations Conference on International Organization  1945
Folk Songs of the Hills Merle Travis 1946
How I Got Over Clara Ward and the Ward Singers 1950
( We 're Gon na ) Rock Around the Clock Bill Haley & His Comets 1954
Calypso Harry Belafonte 1956
I Left My Heart in San Francisco Tony Bennett 1962
My Girl The Temptations 1964
King Biscuit Time Sonny Boy Williamson II and others 1965
The Sound of Music soundtrack Various 1965
Alice 's Restaurant Massacree Arlo Guthrie 1967
New Sounds in Electronic Music Steve Reich , Richard Maxfield , Pauline Oliveros 1967
An Evening with Groucho Groucho Marx 1972
Rumours Fleetwood Mac 1977
The Gambler Kenny Rogers 1978