The Beatles - i feel fine, 1964

"Lennon wrote the song's guitar riff while the Beatles were in the studio recording "Eight Days a Week" in October 1964, and kept playing it between takes. He later recalled: "I told them I'd write a song specially for the riff. So they said, 'Yes. You go away and do that', knowing that we'd almost finished the album Beatles for Sale. Anyway, going into the studio one morning, I said to Ringo, 'I've written this song but it's lousy'. But we tried it, complete with riff, and it sounded like an A-side, so we decided to release it just like that."