Rockabilly
One of the most dominating aspects of the Beatles early repertoire was the country-tinged music that came out of the American south, particularly around Memphis and Sam Phillips's Sun Records. Early Elvis Presley is an example of this style of guitar-dominated bare-bones blues-country combination. In many initial cases, rockabilly (or more derisively, "hillbilly music") country musicians took blues and rhythm-and-blues songs and reinterpreted them. Elvis stripped the horn section from Wynonie Harris's "Good Rockin' Tonight," and Bill Haley did the same with Joe Turner's "Shake, Rattle, and Roll."
The Beatles' favorite source was Carl Perkins. Indeed, George Harrison breifly changed his name to "Carl Harrison" in acknowledgement of one of his musical inspirations. Moreover, Harrison's guitar solos often evoked his love of this repertoire, flavoring much of their music. The Beatles recorded several of Perkins' songs (usually with either Harrison or Starr singing), notably "Everybody's Trying to Be My Baby" and "Honey Don't." However, they also recorded work by the country mainstream (Buck Owens' "Act Naturally") and the extraordinary cross-over artist, Arthur Alexander, whose songs range from country standards ("Detroit City") to pop mainstream ("Anna").
Song Original Recording Beatles
"Everybody's Trying to Be My Baby" (Perkins) Carl Perkins, March 1956 Harrison, Oct-Nov 1964
"Honey Don't" (Perkins) Carl Perkins, December 1955 Starr, October 1964
"Matchbox" (Perkins) Carl Perkins, January 1957 Starr, January 1957
"Act Naturally" (Voni Morrison & Johnny Russell) Buck Owens, 1963 Starr, June 1965
"What Goes On" (Lennon & McCartney)   Starr, November 1965
One of the most important aspects of rockabilly that the Beatles adopted was the instrumentation of the ensemble: lead guitar, rhythm guitar, bass, and drums. Neither the Beatles nor Carl Perkins were were alone in using this arrangement (Elvis used it, as did Buddy Holly), but by embracing this format they embraced a timbre. They would take this sound and apply it to songs from other genres, with George Martin modifying it further by adding piano.

Clayton Perkins, Carl Perkins, W.S. "Fluke" Holland (hidden), and Jay Perkins
Lennon and McCartney's Songwriting/Performance Models

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Lennon and McCartney Outline Songwriting
  2-sep-09