John Lennon and Yoko Ono released a song in an attempt to make a feminist statement, but the controversial title overshadows that.

Things did not quite go to plan and George Harrison walked out of the studio, quitting the band, on January 10, 1969. It came after an argument with Paul McCartney about George's guitar playing.

The Beatles didn't allow guest vocalists to sing lead parts on any of their songs, with just one exception. But who was the ...