The Everly Brothers rock groups of the 1960s. The Beatles, The Beach Boys, and Simon & Garfunkel developed their early styles by performing Everly songs. The Bee Gees, The Hollies, The Marmalade, and other rock and roll groups that feature harmony singing were also influenced by the Everlys. The music of the Everly Brothers influenced the Beatles, who referred to themselves as "the English Everly Brothers" when Paul McCartney and John Lennon went hitchhiking south to win a talent competition. They based the vocal arrangement of "Please Please Me" on "Cathy's Clown." Keith Richards called Don Everly "one of the finest rhythm players."
The Everly Brothers Prine and the Everlys had family connections to Muhlenberg County, Kentucky, and Prine was a frequent performer at the Everly Brothers' Homecoming concerts in Central City, Kentucky, over the years. In 1998, the brothers recorded "Cold" for Andrew Lloyd Webber's and Jim Steinman's musical "Whistle Down the Wind", and the recording was used in stage versions as source music. This would be the final original recording the Everly Brothers would ever make as a duo. In 1999, Don and Edan Everly performed "The Everly Brothers for Kentucky Flood Relief." The brothers joined Simon & Garfunkel in their "Old Friends" reunion