“While the others had got married and moved out to suburbia, I had stayed in London and got into the arts scene through friends like Robert Fraser and Barry Miles and papers like The International Times.”

We opened the Indica gallery with John Dunbar, Peter Asher and people like that. I heard about people like John Cage, and that he’d just performed a piece of music called 4’33” (which is completely silent) during which if someone in the audience coughed he would say, ‘See?’ Or someone would boo and he’d say, ‘See? It’s not silence—it’s music.’ I was intrigued by all of that. So these things started to be part of my life. I was listening to Stockhausen; one piece was all little plink-plonks and interesting ideas. Perhaps our audience wouldn’t mind a bit of change, we thought, and anyway, tough if they do! We only ever followed our own noses—most of the time, anyway. ‘Tomorrow Never Knows’ was one example of developing an idea.
The Beatles Anthology (2000), p. 212