Speaking about writing the song years later, McCartney explained: “Hello, Goodbye was one of my songs. There are Geminian influences here I think the twins, It’s such a deep theme in the universe, duality.
“Man woman, black white, ebony ivory, high low, right wrong, up down, hello goodbye – that it was a very easy song to write. It’s just a song of duality, with me advocating the more positive.
“You say goodbye, I say hello. You say stop, I say go. I was advocating the more positive side of the duality, and I still do to this day.”
Lennon didn’t see this simplistic style of songwriting as as much of a triumph as McCartney did, however.