The story behind
The Beatles recorded "Hey Bulldog" in February 1968, during the filming of a video for "Lady Madonna". The song was born from an idea by John Lennon, who started writing it after United Artists requested another song for the album Yellow Submarine. The basis of the song was already in a demo that Lennon recorded at his home, with a piano that later became the opening riff.
The structure of the song is clear: it has two verses, two bridges and a constant repetition of the initial riff. In the middle, Lennon and McCartney worked on the rhythm, with piano, drums, bass and guitar. At one point, McCartney changed a line of lyrics, something that Lennon accepted. At the end, there was a small rap between Lennon and McCartney, as a touch of humor.
The sound ended up being rough, with a touch of distortion on the guitar and doubled vocals. George Martin produced the session, and the result was a song that felt fresh and direct, like something that came out of the recording without pretension.