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 Lewallen Brothers (bass guitar, vocals) Keith (lead guitar, vocals), Tim (rhythm guitar, vocals) and Bobby Lewallen (organ, vocals). The band soon recruited Dennis Gamble (drums), and were occasionally joined by their sister Gayle Ann (vocals) and father Cal senior (bass guitar), while boasting a repertoire that featured material from the Everly Brothers, Chuck Berry, and the Ventures. With an established presence on the teen dance club and bar circuit, the CoKats entered the studio to record four demos on November 14, 1964. From the sessions, the song "Tough He Was" was presented to record producer Bob Keane, who released the tune on