I recall he admitted in an interview that he had all these snippets of songs and just pasted them all together. He said he did the same for the whole song "Live and Let Die" and see how that turned out. It's about 4 songs in one.

"Sgt. Pepper’s is much easier to admire—for its innovation, for its influence.."
Yeah, bands like Oasis pretty much built their careers on this album.. Ba-dum-dum-tash, badum-dum tash…