Songfacts®:

• Paul McCartney explained to Rolling Stone magazine that he came to this song as well as all the other songs in the album, "with absolutely no concept of what the melody or lyrics would be about." He added: "So it was like writing on the spot, which I think lent an electricity to the whole sound. It's kind of what happens when you write a song... but on speed. You've just got to think of the idea there and then: "First thought, best thought," as Allen Ginsberg said. Instead of spending the next two hours molding it, I would just step up to the mike and go [singing] 'Ooohhhawowahhasingthechanges,' like throwing paint at the wall, and then you just stand back and take a look at it and see whether some of it looks good."