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 in the United States top 40 in mid-1961. Further instrumental singles credited to Kimberly followed, but none of those charted. Phil formed the Keestone Family Singers, which featured Glen Campbell and Carole King. Their lone single, "Melodrama," failed to chart, and by the end of 1962, Calliope Records had gone out of business. The Everly Brothers' last US top 10 hit was 1962's "That's Old Fashioned (That's The Way Love Should Be)," a song recorded but unreleased by The Chordettes and given to the brothers by their old mentor, Archie Bleyer. Succeeding years saw the Everly Brothers sell fewer records