Loud and Quiet by Caspar Babypants and Elizabeth Mitchell
This is more of a chant than a song and you can hear it on the Caspar Babypants album Sing Along. I have the kids pick different animals and then for each animal, we do LOUD and quiet sounds. While we do the LOUD sound (for example, a lion roaring) we clap. While we do the quiet sound we make little sort of pinching motions with our fingers and tiptoe. This gets very chaotic and loud, so be prepared to calm everyone down afterwards.
Me "LOUD LION, LOUD LION, LOUD LION LOUD
LOUD LION LOUD LION LOUD" (kids clapping)
kids all ROAR
Me "quiet lion, quiet lion, quiet lion quiet quiet lion quiet lion quiet"
kids all mew quietly