Conflicting stances here:
From: The Sandman - PM
Date: 05 Jul 17 - 12:23 AM

2. You need to learn to ad lib and keep going, remember the story line and the rhyming scheme, this partly what performing is about, it is much the same with tunes one sometimes make a mistake but it is knowing how to deal with the mistake, that is partly the art of performance

So it's Ok to take the stage if your unsure of words or music, and happy to

Compare this with earlier comments that those taking to the stage must learn the words:

My opinion is positive I believe that performing with words is not necessary and insulting to an audience, it looks to me as if musicans /singers have not bothered to learn the words before they perform, if someone cannot be bothered that is an insult to the audience, therefore your club would not appeal to me, I am not prejudging anything ,I have seen two photgraphs of different performers at your club using words while performing, on that basis i would not wish to attend your club, there is nothing introspective about it or pompous. The only person who is being rude or negative or pompous is you, you cannot accept that people might not want to come to a club where performers appear to be not bothered about learning words.

It seems the author changes his view depending on his own capabilities at the time, always on the understanding that reading lyrics is an absolute no-no.