Simple oral poetry idea

There's an ad at the moment where we hear 'Big bad wolf' repeated and a bit of percussion in between. This is precisely what I suggest that we can do in poetry workshops with children. We can pick a phrase, repeat it to produce a rhythm and then over the top of that spoken rhythm say lines that occur to you: e.g. 'I'm not afraid' or 'I'm scared of spiders' or 'Go away'...You just slot them in whenever you feel like it. You can do it nicely in a circle, where everyone says the chorus and people throw in their lines as and when they want to...