Question: In what year did the group who made up the Nashville String Band with Chet Atkins win a Grammy award?
Sentence (from "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.
Relevant evidence: No