there are all sorts of places where it is not rude to join in the body of the song..I expect people to when I am singing and I join in with them when they are singing...it is what we have always done at least in the past....it is a matter of preference and not virtue. If you don't want it, say so. If you find people don't do it and you want it, say so. Take responsibility for it. Don't ascribe motivation, some of which is nonsensical, such as they want to show they know all the words. What horsefeathers. It is the norm in many places; it is my preferred and expected way of doing things and I would seek out places that did it that way and most likely avoid..and do..the turn by painstaking turn situation where once, in a place where good musicians gather, I counted 10 songs before there was one I wanted to hear. If Joan Baez and Maura O'Connell and Gordon Bok and all my favorite singers were in one place, I still don't want to hear them one by one. I want to hear them all sing together with me signging along. It is a preference..again, not a virtue and not a vice. Tell me where these places are and I will try to go there. mg