Question: Which members of The Clinch Mountain Boys released a recording of "Molly and Tenbrooks" in 1948?
Context: The Stanley Brothers were an American bluegrass duo made up of brothers Carter Stanley (1925–1966) and Ralph Stanley (1927–2016).  Ralph and Carter performed as The Stanley Brothers with their band, The Clinch Mountain Boys, from 1946 to 1966.  Ralph kept the band name when he continued as a solo after Carter's death, from 1967 until his own death in 2016. James Alan Shelton (November 3, 1960 – June 3, 2014) was an American bluegrass guitarist.  Shelton was a solo musician, released 10 albums, and performed with the Clinch Mountain Boys. Vernon Crawford (Jack) Cooke (December 6, 1936 – December 1, 2009) was a bluegrass music vocalist and instrumentalist, known for playing the guitar and bass with artists such as Bill Monroe and Ralph Stanley and the Clinch Mountain Boys.  He was one of nine siblings (four brothers and four sisters) and was a native of Norton, Virginia. Courtney Johnson (December 20, 1939 – June 6, 1996) was an American banjo player, best known for his work as an original member of the band New Grass Revival.  Influenced by Ralph Stanley and his Clinch Mountain Boys, Johnson is often considered to be an inventor of the newgrass style of banjo playing, polished and improved later on by such personalities as Béla Fleck, Alison Brown, Scott Vestal of Sam Bush Band and Jens Krüger of Kruger Brothers. Ralph Edmund Stanley (February 25, 1927 – June 23, 2016), also known as Dr. Ralph Stanley, was an American bluegrass artist, known for his distinctive singing and banjo playing.  Stanley began playing music in 1946, originally with his brother Carter as part of The Stanley Brothers, and most often as the leader of his band, The Clinch Mountain Boys. The flag of the Green Mountain Boys began as a regimental flag used by the Green Mountain Boys.  A remnant of a Green Mountain Boys flag, believed to belong to John Stark, is owned by the Bennington Museum.  It still exists as one of the few regimental flags from the American Revolution.  Although Stark was at the Battle of Bennington and likely flew this flag, the battle has become more commonly associated with the Bennington flag, which is believed to be a 19th-century banner. Leslie Keith (March 30, 1906 – December 28, 1977) was an American bluegrass musician.  Known as a formidable fiddler who won many contests, Keith once played with Ralph Stanley and the Clinch Mountain Boys, as well as The Stanley Brothers.  He is best known for the tune he put together out of pieces of older tunes, "Black Mountain Rag". Carter Glen Stanley (August 27, 1925 – December 1, 1966) was a bluegrass music lead singer, songwriter, and rhythm guitar player.  He formed "The Stanley Brothers and The Clinch Mountain Boys" band together with his brother Ralph.  The Stanley Brothers are generally acknowledged as the first band after Bill Monroe & the Blue Grass Boys to play in the bluegrass genre.  According to some historians, their recording of "Molly and Tenbrooks" (aka "The Racehorse Song") marked the beginning of bluegrass as a genre. "Molly and Tenbrooks," also known as "The Racehorse Song," is a traditional song of the late 19th century.  One of the first recordings of the song was the Carver Boys' 1929 version called "Tim Brook."  The song was recorded by Bill Monroe and His Blue Grass Boys on October 28, 1947 but not released until 1949.  In 1948, The Stanley Brothers released a recording of it in the Blue Grass Boys' style, marking the first recorded adoption of the bluegrass style by a second band.  The song was also recorded by Steve Gillette on his self-titled debut album in 1967 in the folk style and a very different adaptation, by Gillette and Linda Albertano.  Their version was later recorded by the well-known Canadian folk duo Ian and Sylvia for their album, Play One More. George Shuffler (April 11, 1925 – April 7, 2014) was an American bluegrass guitar player and an early practitioner of the crosspicking style.  During his career Shuffler played with The Bailey Brothers, The Stanley Brothers and Ralph Stanley's Clinch Mountain Boys.  He was a 2007 recipient of the North Carolina Heritage Award and in 2011 was elected to the International Bluegrass Music Hall of Fame.
Answer: The Stanley Brothers