The Banality of Genius: Notes on Peter Jackson’s Get Back:

Paul: To wander aimlessly is very unswinging. Unhip.

Later…

As viewers, we get bored of seeing them rehearse it and we see only some of it: on January 23rd alone they ran it through 43 times. The Beatles don’t know, during this long process, what we know – that they’re creating a song that millions of people will sing and move to for decades to come. For all they know, it might be Shit Takes all the way down. But they keep going, changing the lyrics, making small decision after small decision – when the chorus comes in, where to put the guitar solos, when to syncopate the beat, how to play the intro – in the blind faith that somewhere, hundreds of decisions down the line, a Beatles song worthy of the name will emerge.