Some interesting points! I first became aware of the memory thing a few years ago when a lot of singers at a three-day summer jam session started pulling out their scrapbooks to sing from (and they hadn't in prior years). I mentally scoffed at this, but by the next year I really wished I had brought my "cheat sheets" along! In regard to the people who are at the level of producing hit records, I've often thought it must be both a blessing and a curse to have such popular material that that's all you are expected to do - just your past hits. Like the Kingston Trio having to do "Scotch & Soda" etc. It must be deja vu all over again !