Hear The Lively Song
(source: this song is called "The Frogs" in "Jubilee
Songbook", Girl Guides of Canada, 1971.)
(On the first line of the song, everyone is crouched on the floor like a frog. At the "Barrrump", everyone jumps up in the air and claps their hands over their heads. Once everyone is familiar with the words and actions, split your singers into as many small groups as you'd like. Have each group start singing at slightly different times, and have them repeat the song as many times as you'd like. The overall effect is of a frog pond in spring with lots of frogs croaking!)