The Everly Brothers (Don Everly, born Isaac Donald Everly February 1, 1937, Brownie, Muhlenberg County, Kentucky, Phil Everly, born Phillip Everly, January 19, 1939, Chicago, Illinois) are male siblings who were top-selling country-influenced rock and roll performers, best known for their steel-string guitar playing and close harmony singing. The Everlys are the most successful charting U.S. rock and roll duo on the Hot 100. Their greatest period of chart success came between 1957 and 1964. Wikipedia
I was in Marine boot camp in 1963, and I remember their songs, the one I liked the Most was A thousand stars in the sky.