it really does matter how old they are. Six to eight year olds will just like the songs off the kidz cds. Put your finger in the air, grand Old Duke of york, Acting out Mr Froggy went a courting - having fun selecting whose going to play what.. ...

In fact Mr froggy will fill half an hour on its own. Teaching the song,Putting in the ho hums, then the claps. then doing the playlet a couple of times trying a different set of actors.

Ask the teacher who will act. You don't want someone who will just stand there embarrasssed making dumb faces at the class.

Don't let the teacher bugger off. you're not insured for the situation. they probably won't - its more than their jobs worth. they are in loco parentis.