A few thoughts as I read this thread- my 2 year old tends to make noise all the time. If it's going to be screaming or singing, I would choose singing. Any attempts I would make to make her stop singing would result in the screaming, which isn't going to stop. She's my third kid so I'm not new to the parenting thing, she just has a unique personality (a lot of the reason we spend so much time at home, out of public view). Secondly, I see people mentioning talking to the parents and if that doesn't work, talk to the kids. Honestly, with my older 2 kids, you would get a lot further talking directly to them. Embarrassment is a great natural consequence and I'm okay with that.