Beatles
Assuming you mean the big crescendo and final chord, supposedly each player was told "here's where to start, and here's the note to wind up on after x measures, get to it however you want."
Like most Beatles stories, this might be accurate, or it might be story that somebody thought sounded good and has survived for all these years because it does sound good. Getting the absolute truth about anything relating to the Beatles is more tricky than you might expect, for a number of reasons, including (i) they have been so popular for so long that myths just naturally follow them and (ii) John, in particular, had a flexible perception of reality (a good story can be more "true" than a completely accurate one).