 The lines referencing Mao Zedong – "But if you go carrying pictures of Chairman Mao / You ain't gone make it with anyone anyhow" – were added in the studio.While filming a promotional clip later that year, Lennon told the director that it was the most important lyric in the song.The Beatles began the recording sessions for their new album on 30 May, starting with "Revolution 1" (simply titled "Revolution" for the first few sessions).