Sure, I'll comment. I don't feel I have to apologize or explain why I depend on song sheets.

It's not relevant!

Begrudgingly I will tell you all that I have a brain condition called Hydrocephalus-which affect memory among many other symptoms.

It's much improved since a brain operation 5 years ago, but why should I have to show my "handicap" sticker(figuratively, though I do have one for parking a vehicle)if I do participate in a stage presentation?

I think it's rude to comment on the use of written sheets. Do we criticize classical musicians when they do this?