A majority of the concerts and house concerts that I attend accept and sometimes even encourage participation. The folks I usually hang around with are singers-some better than others some livingroom singers some performers-still there is a wonderful joy in a full house chorus. There have been a number of times that a performer has been surprised with their song being a chorus song when perhaps it wasn't written that way. This may be disturbing, but they usually accept the situation with good grace. The eye contact and personal stories (along with the participation) are other things that make live music such a wonderful experience.