Question: In what year did the group who made up the Nashville String Band with Chet Atkins win a Grammy award?

full_context: Document 1: The Bandit (album): The Bandit is an album by The Nashville String Band. The band consisted of Chet Atkins and Homer and Jethro.
Document 2: Lonzo and Oscar: Lonzo and Oscar were an American country music duo founded in 1945 originally consisting of Lloyd George (1924-1991) as "Lonzo" and Rollin "Oscar" Sullivan (1919-2012), best known for being the first to perform the 1948 song "I'm My Own Grandpa". George departed in 1950, and Lonzo was later portrayed by Johnny Sullivan (1917-1967) from 1950 to 1967 and by David Hooten from 1967 to 1985, when the band retired (with some final shows performed by Sullivan and first Cleo C. Hogan, then Billy Henson, the latter of which eventually bought the rights to the name). Lonzo and Oscar owned a record label, a recording studio, and a music publishing company. The recording studio and the record label were called "Nugget". The music publishing company was called "Lonzo and Oscar (BMI)". Melba Montgomery's first recordings were released on Nugget Records in the late 1950s through the early 1960s. The songs which Starday Records released by Melba Montgomery in the 1960s came from Nugget Records. Harlan Howard recorded an album with Nugget Records. Danny Harrison, Melba Montgomery, and Darnell Miller wrote for Lonzo and Oscar's publishing company, Lonzo and Oscar (BMI).
Document 3: The Nashville String Band (album): The Nashville String Band is the 1969 debut album by The Nashville String Band. The band consisted of Chet Atkins and Homer and Jethro. Atkins produced many of Homer and Jethro's later RCA albums and they in turn performed on a number of his.
Document 4: Chet Atkins discography: Chet Atkins' discography is large and diverse. Not only did he release principal studio albums as a solo artist, he was a prolific and much sought-after collaborator. He also played as a sideman on many more. His major collaborations were with Hank Snow, Arthur Fiedler and the Boston Pops Orchestra, The Country All-Stars, The Nashville String Band, Jerry Reed, Merle Travis, Doc Watson, Lenny Breau, Les Paul, Mark Knopfler, Suzy Bogguss, Floyd Cramer and Tommy Emmanuel. He frequently guested on a track or two with other friends. Several of his recordings won or were nominated for Grammy Awards.
Document 5: Jim Reeves: James Travis Reeves (August 20, 1923July 31, 1964) was an American country and popular music singer-songwriter. With records charting from the 1950s to the 1980s, he became well known as a practitioner of the Nashville sound (a mixture of older country-style music with elements of popular music). Known as "Gentleman Jim", his songs continued to chart for years after his death. Reeves died in the crash of his private airplane. He is a member of both the Country Music and Texas Country Music Halls of Fame.
Document 6: Down Home (The Nashville String Band album): Down Home is an album by The Nashville String Band. The band consisted of Chet Atkins and Homer and Jethro.
Document 7: World's Greatest Melodies: World's Greatest Melodies is an album by The Nashville String Band. The band consisted of Chet Atkins and Homer and Jethro.
Document 8: Music of Iowa: The music of Iowa includes such notable musicians as Rock and Roll Hall of Famers The Everly Brothers (who had 3 #1 Top 100 hits, including "All I Have to Do Is Dream" in 1958), Bix Beiderbecke, Art Farmer, Peggy Gilbert, Patty Waters, Mortimer Wilson, Thurlow Lieurance, Charlie Haden, Arthur Russell, Greg Brown, William Elliott Whitmore, Clarence Whitehill, Meredith Willson, composer of "The Music Man", and Alice Ettinger who was renowned enough to perform in Europe in the 1890s. Famed swing era musician and band leader Glenn Miller was born in Clarinda. Bands from Iowa include For Today, Euforquestra, The Envy Corps, Hawks, Slipknot (who had 2 #1 Billboard 200 albums like "All Hope is Gone" in 2008), Radio Moscow, Modern Life Is War, and Unknown Component. The city of Walnut is home to the National Traditional Country Music Association (NTCMA), which produces programs for local radio and television in Iowa. NTCMA also operates the Walnut Country Opera House, which is a theatre and home to several halls of fame and museums. The town of Clear Lake is known as the place the Big Bopper, Buddy Holly and Ritchie Valens took off from on the day they died; their last performance was at the Surf Ballroom. The Escorts (Iowa band) (Do's & Don'ts) are one of the first bands to be inducted into the Iowa Rock N Roll Music Association's Hall of Fame.
Document 9: Strung Up (Nashville String Band album): Strung Up is a studio album by The Nashville String Band. The band consisted of Chet Atkins and Homer and Jethro.
Document 10: Chet, Floyd &amp; Boots: Chet, Floyd & Boots is a studio album by American guitarist Chet Atkins, pianist Floyd Cramer and saxophone player Boots Randolph. Boots had a novelty hit with "Yakety Sax" which Chet covered, playing the saxophone lead on guitar, as "Yakety Axe" - which also became a hit. Cramer was a regular session musician at the Nashville studios, playing with a multitude of artists including Elvis Presley and Brenda Lee, helping to define the "Nashville Sound" that Atkins had also helped develop. The trio briefly toured together.
Document 11: Conway Twitty: Conway Twitty (born Harold Lloyd Jenkins; September 1, 1933 – June 5, 1993) was an American country music singer. He also had success in the rock and roll, rock, R&B, and pop genres. From 1971 to 1976, Twitty received a string of Country Music Association awards for duets with Loretta Lynn. Although never a member of the Grand Ole Opry, he was inducted into the Country Music Hall of Fame and the Rockabilly Hall of Fame.
Document 12: Chet Atkins: Chester Burton "Chet" Atkins (June 20, 1924 – June 30, 2001), known as "Mr. Guitar" and "The Country Gentleman", was an American musician, occasional vocalist, songwriter, and record producer, who along with Owen Bradley and Bob Ferguson, among others, created the country music style that came to be known as the Nashville sound, which expanded country music's appeal to adult pop music fans. He was primarily known as a guitarist. He also played the mandolin, fiddle, banjo, and ukulele.
Document 13: Homer and Jethro: Homer and Jethro were the stage names of American country music duo Henry D. "Homer" Haynes (1920–1971) and Kenneth C. "Jethro" Burns (1920–1989), popular from the 1940s through the 1960s on radio and television for their satirical versions of popular songs. Known as the Thinking Man's Hillbillies, they received a Grammy in 1959 and are members of the Country Music Hall of Fame.
Document 14: Hager Twins: The Hager Twins, also known as the Hager Brothers and The Hagers, were a duo of American country music singers and comedians who first gained fame on the TV series "Hee Haw". They were identical twin brothers Jim (August 30, 1941—May 1, 2008) and Jon Hager (August 30, 1941—January 9, 2009).
Document 15: Identified!: Identified! is an album by The Nashville String Band, released in 1971. The band consisted of Chet Atkins and Homer and Jethro.
ground_truth: 1959