Taken from his autobiography titled Life

“So we’re the song factory. We start to think like songwriters, and once you get in the habit, it stays with you all your life. It motors along in your subconscious, in the way you listen….And there’s nothing you can do; you don’t realize its’s happening. It’s totally subconscious, unconscious or whatever. The radar is on whether you know it or not. You can not switch it off…..You’re constantly on the alert.”