I worked in information graphics for two years and never got to do anything this cool. Behold “The Beatles: Authorship and Collaboration” by Michael Deal:
This graph (based on authorial attributions quantified by William J. Dowdling in the book Beatlesongs) traces songwriting contributions within the band… Color patterns offer clues about the band’s gradual fracturing as each member becomes more independent. Red stalks (signifying jointly written songs) decrease in the second half of the timeline; the split-color bars give way to solid bars of a single color. George Harrison also began to compose more music as he matured as a songwriter, signified by the increase in green bars.
See also: Self Reference, Song Keys and Working Schedule.
This, 2-minutes after I posted about the Beatles. Liverpool zeitgeist.