I haven’t seen any of the new Peter Jackson Beatles documentary, but this clip is pretty amazing. It’s from a January 7, 1969 studio session, that starts with Paul McCartney apparently aimlessly jamming on his guitar like a sky high college sophomore. 35 seconds in George Harrison unleashes a huge yawn. Fifteen seconds later something starts to happen:
BTW McCartney is all of 26 years old in this clip, and the Beatles have only a few months left to live.