Im sure the Beatles used clicks on somethings, makes sense blackbird is all acoustic, a ballad... no drummer, how else would you be able to stay in time, if he did it all live than it certainly would make sense.

But if Ringo was goign to be playing on it, there would have been no click track.

So you found an example, but MOST beatle songs were done live band, no click.

i've tried to add a metronome to dozens of their songs, and it never works. certain passages work but it starts to drop off as the song progresses.

Show me a led zepplin song played to a click track...bet it takes u a long time lol j/k