That's interesting @Joe Riley. I guess I just assumed they put stuff together and it came out like magic, without much thinking about it. Thanks for the post. Although I don't understand a lot of it, I get the broad picture.
"Born in 1918 and hailed as one of the most accomplished and astute musical minds in American history, Leonard Bernstein could not only appreciate the techniques and innovations of the youth-driven pop-rock explosion of the Sixties, he could get the ear of his middle-aged peers and explain to them just what they were missing. "The television broadcast Inside Pop: The Rock Revolution (1967) gave Bernstein a mass-communication platform on which to perform this analysis, asking aloud the questions of (a) why this music so infuriates Americans over a certain age and (b) why he himself likes it so much." An excerpt for music techies (11 mins): Leonard Bernstein on pop music and the Beatles
The Beatles Songwriting Analyzed - Brian Hartzog The Beatles as Songwriters "The main songwriting team in the Beatles was John Lennon and Paul McCartney--especially in the Formative and Early stages of their career. "Although George Harrison wrote several important songs (and made significant contributions to the overall Beatles sound and band direction), he wasn't a major contributor of songwriting ideas until Revolver. "John and Paul wrote over 75% of the songs--and nearly all of the hits. "Ringo was an important part of the overall Beatles sound and live performance energy, but was not a significant songwriter. His major songwriting contributions are the “Ringo-isms” that John and Paul incorporated into their work. "So when you're thinking of the Beatles songwriting (especially until Revolver), you're most likely thinking of the cowriting relationship of John Lennon and Paul McCartney".
"Contrary to common belief, Ringo Starr did not write Yellow Submarine, although he sang the lead vocal." He DID write The Octopus's Garden (Harrison helped a lot). Source