"Hey Bulldog" is a song by the English rock band the Beatles released on their 1969 soundtrack album Yellow Submarine. Credited to Lennon–McCartney, but written primarily by John Lennon, it was finished in the recording studio by both Lennon and Paul McCartney. The song was recorded during the filming of the "Lady Madonna" promotional film, and, with "Lady Madonna", is one of the few Beatles songs based on a piano riff. It had a working title of "She Can Talk To Me". For many years, "Hey Bulldog" was a relatively obscure and overlooked song in the Beatles' catalogue; it has since been reappraised by fans and a number of critics and musicians as one of the band's best rock songs. Background and composition John Lennon began composing "Hey Bulldog", originally "Hey Bullfrog", after United Artists requested another song by the Beatles for Yellow Submarine, the upcoming soundtrack album for their animated film of the same name. Demo recordings made in the winter of 1967–68 at his Kenwood estate in Weybridge include the melody that later became the song's chorus, as well as a section working out the "she can talk to me" passage. The finished composition of "Hey Bulldog" is in common time (4/4) and employs a shifting key, changing between B major, A major and B minor. Commentators have variously described the song as hard rock, blues-based rock, psychedelic rock, pop rock, acid rock or a simple rock number. In a beginning reminiscent of the Beatles' cover of Barrett Strong's "Money (That's What I Want)", the song's opening piano riff is played in octaves before being doubled in a higher register by two guitars and a lower bass register. The song includes two bridges and two middle verses, with the bridge closer in style to a refrain. The song's introductory riff repeats throughout the song, appearing at the end of the refrain and the outro, as well as further influencing the refrain. The song's lyrics utilize heavy word play, which Lennon later said "[mean] nothing". Recording The Beatles went to EMI's Studio Three on 11 February 1968 to record a promotional film for "Lady Madonna", but decided upon arrival to record a new song instead. Lennon suggested his half-completed idea "Hey Bullfrog", which he and Paul McCartney finished while in the studio. McCartney later recalled misreading Lennon's handwritten lyrics, changing "measured out in news" to "measured out in you",