Number 6 is good with me and i agree that the cultural influences were involved. The Beatles acted like a catalyst on the culture, it's like there were all these elements bubbling away but they needed the Beatles to fuse them. It all seems kind of mythic and inevitable now.
It's interesting to think that when the Beatles came Rock N Roll had seemed to have come and gone. Shouldn't the rock n rollers have changed everything? They didn't it was the Beatles from Liverpool that somehow made it all bubble over in a way that is astonishing.
It's like the Beatles were able to tap into all this cultural stuff that had not percolated out fully into society and they grabbed it threw it into the mix and it all bore fruit: Rock N Roll, surrealism, Spirituality, Beat poetry, psychedelics, collage, music concrete, music hall, pop art, Motown.
And the music gushed out and over 50 years after it all started we're all still boggled by it, still love it with a passion, it still feels meaningful to us.