I think you need to mention it to the teacher - and just see if she can sit the kids on opposite sides of the room ...and there is a certain amount of 'sucking it up' that needs to happen - i advise you to talk to teh teacher because i have BTDT - when my son was in 3rd grade there was a boy who sang loudly - to be purposefully obnoxious - he did it in art class - my sons FAVORITE class and my son