Paul [wrote this]. That was from a lecture of Maharishi where he was talking about nature, and I had a piece called “I’m just a child of nature,” which turned into “Jealous Guy” years later. Both inspired from the same lecture of Maharishi.
~John Lennon (September 1980, Playboy interviews)
‘Come Together’ changed at the session. We said, ‘Let’s slow it down. Let’s do this to it, let’s do that to it,’ and it ends up however it comes out. I just said, ‘Look, I’ve got no arrangement for you, but you know how I want it.’ I think that’s partly because we’ve played together a long time. So I said, ‘Give me something funky and set up a beat, maybe.’ And they all just joined in. „
—John Lennon, 1969
“ On the new album I like ‘Come Together,’ which is a great one of John’s. „
—Paul McCartney, 1969
Julia was written by John Lennon for his mother, she died in a traffic accident in 1958. It is also the only solo Lennon recording in The Beatles’ song catalogue.
“The only solo Lennon recording in the Beatles’ catalog, “Julia” was the final addition to the White Album, recorded just three days before the album was sequenced. His original demo, recorded in May, had included harmonies from McCartney, but this version was just Lennon’s voice and guitar. “Julia was my mother,” Lennon said. “But it was sort of a combination of Yoko and my mother blended into one” — the “ocean child” in the lyrics refers to Ono’s name, which is Japanese for “child of the ocean.” To the end of his life, he often called Yoko “Mother.”” – Rolling Stone Magazine
They did 3 takes to perfect the guitar track, which was recorded onto four-track tape. The third track was the chosen one for “The Beatles” (aka “The White Album”)
I just started playing it and this tune came, ‘cuz that’s what happens. They just, sort of– they COME, you know. It just came and I couldn’t think of any words to it, so originally it was just, ‘Scrambled Egg.’ It was called ‘Scrambled Egg’ for a couple of months, until I thought of ‘Yesterday.’ And that’s it. True story.
—Paul McCartney, 1968
‘Yesterday’ is Paul completely on his own, really. We just helped finishing off the ribbons ’round it, you know — tying it up.
—John Lennon, 1966
Wikipedia:
“Yesterday“was originally recorded by the Beatles for their 1965 album Help!. Although credited to “Lennon–McCartney”, the song was written solely by Paul McCartney. At the time of its first appearance, the song was released by the Beatles’ record company as a single in the United States but not in the United Kingdom (for further details see below). Consequently, whilst it topped the American chart in 1965 the song first hit the British top 10 three months after the release of Help! in a cover version by Matt Monro. “Yesterday” was voted the best song of the 20th century in a 1999 BBC Radio 2 poll of music experts and listeners and was also voted the No. 1 Pop song of all time by MTV and Rolling Stone magazine the following year. In 1997, the song was inducted into the Grammy Hall of Fame. Broadcast Music Incorporated (BMI) asserts that it was performed over seven million times in the 20th century alone.
“We were totally immersed in the whole saga which was unfolding. So I got the idea of using a blackbird as a symbol for a black person. It wasn’t necessarily a black ‘bird’, but it works that way, as much as then you called girls ‘birds’; the Everlys had had Bird Dog, so the word ‘bird’ was around. ‘Take these broken wings’ was very much in my mind, but it wasn’t exactly an ornithological ditty; it was purposely symbolic.”
– Paul McCartney (Mojo, 2008)
“It’s such a beautiful piece of music, perfect in composition and performance, and in its lyrics and in the range of his voice. Just learning that song made me a better guitar player and gave me a better appreciation of songwriting. To me it’s just musical bliss.”
– Dave Grohl (Q Magazine)
