Although I will sometimes work "off the dots" for some songs on a long gig (say 2 hours plus), I do try to work from memory. Up to press my memory has been quite good, but increasing antiquity can cause the odd "senior moment".

Busk or make it up is usually my solution.

"In the middle of Sir Patrick Spens
I forgot the twenty-seventh verse
So I sang the forty-second
Twice as fast and back to front
And no-one noticed!"
(Parody of "The Boxer" - Noel Murphy et al)

To my knowledge harlowpoet always reads his poems, so ...

Tolerance is best - "Judge not, lest ye also be judged"!

Alan