I have had that problem at a summer camp I work at, ages 10 to 18. a LOT of the "unstructured" entertainment is singing. new campers usually sit like lumps on a log, the "returnees" join in. but by the end of a week, I would say 9.9 out of 10 of the campers are singing lustily. I think a lot of that is that the entire staff likes to sing, sings frequently, obviously enjoys both what they are singing and singing itself. of course, this is a group that is isolated from the real world for a weekMMario