The stone that the builder refused
Over 5000 posts
he lost that range and tone i guess before the beatles were even done.
I always saw that as the real dividing line between Lennon and McCartney - that McCartney never went for introspection the way Lennon (and Harrison) did. That's a generalization, but Lennon would have never sang Listen to What the Man Said or Silly Love Songs or any of the cloying, tra la la lightweight commercial pop that McCartney churned out, and McCartney would have never sang...well, most of Lennon's post-Beatles songs. Just pick one at random. Ha.
But of course it was that dichotomy that made The Beatles in the first place. And it was why both of them were only occasionally great separately, while they were pretty consistently great when they worked together. But then very few songwriters are consistently great throughout their careers. Most peak when they're young.