I can't think of many, pros included, that haven't at one time or another missed a verse or 2 or ccouldn't finish what they started. Those that earn their keep from singing practice far more than most & they are constantly refreshing their stock so they tend to forget less but still most forget once in a while. I'd always give the singer a chance or 2 to recover or if I knew the line I'd pass it along but if the song has been sung more than a few verses pass it over. I can't imagine some one singing a 10 verse ballad & forgeting the last 2 verses then start up with another 8 verse song only to get through most & lose it again at the end, bad taste. But to call some one on forgetting it is just not the way to go about it. How about a little encouragement or "hey you made a good go at it. It's a nice song would you bring it in again". Personally I'd rather not see books or notes unless someone's trying out a song & is looking for feed back. When the singer makes the song theirs, & they should IMHO before they sing it, I'd rather hear half a song from them than a word perfect song that isn't theirs sung off a sheet. When the singer has internalized the song & made it theirs it's a lot easier to sing it even if they haven't done it in a year or so, it makes it a lot easier to refesh it just prior to singing it too. Some sessions every one brings in a book & notes & does the same song off the same page all together, over & over. Makes for a pretty boring sing. If someone wants to start up a practice session that's something else. If the singer's a beginner that's a horse of a different color too. They should be encourged to sing the songs they want to & learn them, then help to weaned them away from reading the song. The RUS sessions have been hashed & rehashed here over the years I'm not about togo there. Be kind to the singer you may learn a thing or 2 from them, even the beginner & the novice have things to teach (they may not know it but) & offer to others to those more seasoned. There's always the side (& responsibility) where the seasoned should take the unseasoned & help them along the road a bit. Barry