The Blue Sky Boys
The Blue Sky Boys were an American country music duo consisting of the brothers Earl Bolick ( November 16 , 1919 – April 19 , 1998 ) and Bill Bolick ( October 28 , 1917 – March 13 , 2008 ) , whose careers spanned over forty years . 
<triplet> The Blue Sky Boys <subj> country music <obj> genre