 While highlighting the studio techniques used to achieve the completed recording, MacDonald considers "What You're Doing" to be a possible rival to "I Feel Fine" as the Beatles' "first sound experiment".Several of the album's cover versions had been staples of the Beatles' live shows in Hamburg and at The Cavern Club in Liverpool during the early 1960s.These songs included Chuck Berry's "Rock and Roll Music", sung by Lennon, Buddy Holly's "Words of Love", sung by Lennon and McCartney with Harrison, and two by Carl Perkins