Now if there were singing Sessions were every one joined in on most of the songs, or people sang cannons or part arrangements I'd love to attend, and sing, but that doesn't happen (well at least not yet).

Don't know where you live, PP, but if you ever get to Sheffield on a second Thursday evening, check out "Raise the Roof" at the Red Deer: every now & then someone does something that's not a singalong, but it's definitely the exception.

As for ego trips and lack of consideration/social skills... as has already been pointed out, singers don't have a monopoly on this behaviour. I have been to a "mixed session" where at least one fellow practiced ("quietly") the tune he was planning to play on his next turn -- while other people were singing and/or playing (and without moving from his spot in the session). I have also been in sessions where someone with an instrument decides to accompany a singer, can't manage it in the same key as the singer, but continues anyway. When this happens to me, I change key (if I can) to accommodate the player, even though I may end up singing lower/higher than I am comfortable with/sounds good -- but I still think it's a bit rude, to be honest.

Unfortunately, rudeness & ego can be found in just about any activity that involves more than one human being...

Cheers,

YY