Kelly Willis included a cover of a 1977 song by which country music duo?
Kelly Willis (album):  There were a couple of minor Billboard hits in the #63 "Heaven's Just a Sin Away" (covering a 1977 #1 hit for The Kendalls) and the #72 "Whatever Way the Wind Blows." The Kendalls: The Kendalls were an American country music duo, consisting of Royce Kendall (September 25, 1935 – May 22, 1998) and his daughter Jeannie Kendall (born October 30, 1954).
The Kendalls