Good ol' Georgie!
I do find myself smiling at the image of John and Paul knocking heads together in Mendips or Forthlin Road, with their guitars, listening to Everly Brothers and Buddy Holly and the Crickets and whatnot, trying to mimic the way their voices intertwine, going "I'll be Don, you be Phil - no, don't sing THAT bit, that's my part and you do the 'woooo' and I'll play the rhythm part too."
Especially since I've been inside both houses... John's bedroom was electric. I could picture him so clearly in that room, strumming away, going down to let Paul in at the backdoor and then to the bathroom with the guitars for its superior acoustics. Oh to have been there... I wish I had a friend like that. I have a boy that I harmonise with in his band, but we're not exactly Lennon-McCartney.