I have a young group and I've been reading the children stories while they eat their meals because I have a 'captive' audience and I start singing songs and bring out the finger puppets and my feltboard with interactive games after I wash them up. It's working because first they learn that what I'm doing is interesting and entertaining. Then after they reach the age of 2 or so when I start to do this type of thing in the toyroom they stop what they are doing and gather around me. It's a learning process for the little ones and it takes patience for us and figuring out how to handle things so they work in a stress-free manner!
But don't let anybody tell you there are rules. Some days I just break into song now and then and we do a couple things then the children go back to playing and a while later we'll dance and sing again. It doesn't have to be structured.