This graph (based on authorial attributions quantified by William J. Dowlding in the book Beatlesongs) traces songwriting contributions within the band.
Click for ginormous graphic:
Source: Charting the Beatles
Please use the comments to demonstrate your own ignorance, unfamiliarity with empirical data and lack of respect for scientific knowledge. Be sure to create straw men and argue against things I have neither said nor implied. If you could repeat previously discredited memes or steer the conversation into irrelevant, off topic discussions, it would be appreciated. Lastly, kindly forgo all civility in your discourse . . . you are, after all, anonymous.