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

Context paragraphs:
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.

Picks the Best: Chet Atkins Picks the Best is the title of a recording by guitarist Chet Atkins.  At the Grammy Awards of 1968, "Chet Atkins Picks the Best" won the Grammy Award for Best Pop Instrumental Performance.

Identified!: Identified!  is an album by The Nashville String Band, released in 1971.  The band consisted of Chet Atkins and Homer and Jethro.

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.

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.

The Bandit (album): The Bandit is an album by The Nashville String Band.  The band consisted of Chet Atkins and Homer and Jethro.

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.

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.

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.

Me &amp; Chet: Me & Chet is the title of the follow-up to "Me & Jerry", the successful duet recording by Chet Atkins and Jerry Reed.  It was nominated for the 1972 Grammy Award for Best Country Instrumental Performance but did not win.  Chet's solo release "Chet Atkins Picks on the Hits" was also nominated in the same category.  It reached No. 24 on the Billboard Country Album charts.

Supporting paragraphs: World's Greatest Melodies Homer and Jethro
Answer: 1959