That’s one of the first songs i learned to play from memory with the backing track years ago, even now i can still remember how to play the main parts of it.
I find the hardest part of trying to remember how to play any tune is the solo section as solo sections tend to go outside of the main melody and some solo sections get too technical when they could be made a lot simpler.
I have the same issue with the solo’s you get to know the old songs pretty well by hearing them thru the years but solo’s don’t necessarily follow the tune
and are usually played ad libbed making them difficult to play