I used this song as a warm up for my KS2 Choirs and they absulutely loved it. The song uses a melodic ostinato as its basis and you can sing the round as many times as you like although I have added an 'ending' into the score for the purpose of sharing with you. You can vary the number of groups you sing in along with the dynamics to maintain interest and perhaps invite the children to invent their own melodies to fit in with the simple basic harmony. Pupils could also create instrumental accompaniments to create a real performance. The possibilities are endless with this song ... hope you have fun with it!
