Ha---not as much of a musicologist as one might think; just a by-ear player who never really learned to read music because my ear was too efficient. Growing up, however, around all kinds of music and plunking along---by ear---on the piano gave me a top-of-my-head repertoire that served well at all the weddings, bar mitzvahs, fundraisers, conventions and whatever other stuff we did in lieu of nightclubs the last 15-20 years of my 'career'---union wages tended to jack the price of a band to where the young and hep were not the ones paying the bills, and those who were wanted the 'top 40' of the forties, thirties, or even twenties---Wait a minute.....how did I get on THIS?
Anyway, if an arrangement required a reading guitarist (one such was seldom added unless he sang his ass off, in which case I was assigned elsewhere), I would spend a break reading (one note at a time, like the way I type) and memorizing the part.
_________________________
Structure of Twist and Shout? As far as I know, it's modeled after Latin / Mexican / whoever else folk songs with three chords in a I - IV - V - IV sequence like La Bamba or Louie Louie (which alters the V chord to minor, but it's legal

)---I know; not a very sophisticated seminar, is it?
EDIT: Didn't mean to imply that the two examples are actually folk songs although the original Louie Louie may be.....