“"A few incidents have been suggested as inspirations for the song's cryptic lyrics, which recall in tone those of "She Said, She Said": In his a 2007 book, Can't Buy Me Love, Jonathan Gould claims that Lennon wrote the song in response to an official press release promoting a Sinatra TV special as a show for those who were "tired of kid singers wearing mops of hair thick enough to hide a crate of melons." No Lennon biography or Lennon quotation is cited to substantiate Gould's theory. According to journalist Richard Simpson, Lennon wrote the song in response to Mick Jagger of the Rolling Stones boasting about his pop-star girlfriend ("bird" in British Isles slang) Marianne Faithfull.[7] The line "You say you've seen seven wonders" may refer to the night the Beatles smoked pot with Bob Dylan in New York in 1964. The experience caused a stoned McCartney to excitedly pronounce what he had just learned was the key to life: "There are seven levels." WIKIPEDIA. Which theory do you support?”

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