"Birthday" is a song written by John Lennon and Paul McCartney and performed by The Beatles on their eponymous double album The Beatles. It is the opening track on the third side of the LP (or the second disc in CD versions of the record). This song is a prime example of the Beatles' return to more traditional rock and roll form, although their music had increased in complexity and it had developed more of its own characteristic style by this point. There has been confusion over the years whether it was mostly a Paul song or not, but in an interview in the September 2008 edition of Mojo McCartney said of the song: "Birthday was 50-50 me and John.".
The song was largely written during a recording session at the EMI Abbey Road Studios on September 18, 1968 with Paul McCartney coming up with the main riff. During the session, The Beatles (along with the recording crew) made a short trip around.
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