BeaTles 4 Ever!
The genius formula for the Beatles was: Never have a formula. I heard one of their interviews once where, maybe Ringo, said they never did the same song twice. Evidence their album sequence. Every album was not an evolution from the previous but a break from it; a new direction. Yet, there is always the beat. The relentless beat. From their early rock ’n’ roll covers thru Dear Prudence and beyond, there is the beat.
Your analysis is a thrilling read! How the Beatles did their complex music without being able to read music just goes to show how creative true genius can be. Today, so many years later, one hears Beatle music practically everywhere. May their music give endless joy to endless generations to come!