which Lennon preferred to the original. George Martin produced the session, assisted by balance engineer Geoff Emerick. The camera crew remained in the studio with the band as they recorded the basic track, featuring piano, drums, tambourine, bass guitar and rhythm guitar. As the band neared the end of the basic track for "Hey Bulldog", McCartney attempted to make Lennon laugh by barking like a dog. Lennon changed the song's name to "Hey Bulldog", though the title phrase does not appear until the outro. After the band had recorded ten takes, the last attempt was marked "best". The camera crew left as the band continued working on the song with various overdubs onto take ten, including off-beat drums from Ringo Starr, a distorted Gibson SG from George Harrison for the song's intro, double tracked vocals from Lennon and a harmony vocal from McCartney. Borrowing Harrison's SG, Lennon recorded a lead guitar solo. After the band finished adding overdubs, Martin and Emerick mixed the song for mono twice. While the Beatles would often ad lib offhandedly at the end of recordings, their other songs faded out before this became audible. Martin and Emerick decided to instead leave the dog barks, shouts and screams in the final recording, at one point adding heavy compression to some of Lennon's dialogue and dog noises. They raised the song in pitch slightly, running the playback fast. With the mono version intended for use in the animated film, Emerick returned to Studio Three on 29 October 1968 to mix the song for stereo, this version being included on the original soundtrack LP. Release Apple released Yellow Submarine in the US on 13 January 1969, with "Hey Bulldog" sequenced as the fourth track, between "All Together Now" and "It's All Too Much". Release in the UK followed four days later. Emerick praised McCartney's bass playing on the recording, describing it as his most inventive since that of Sgt. Pepper's Lonely Hearts Club Band. During these sessions, a film crew photographed the Beatles recording the song at EMI's Abbey Road studios for a promotional film to be released during their scheduled four-month retreat to India (which was later edited together as a promotional film for the single "Lady Madonna"). The song was used in a segment of the animated film Yellow Submarine. Initially, it appeared only in some European theatrical prints. It was cut from the American version