Clapping music is a minimalist piece written by Steve Reich in 1972. Steve Reich is one of the greatest American composers living today; he was just awarded the Pulitzer Price in music in 2009. (For educators, you may click HERE to access to an educational page about Steve Reich by Carnegie Hall)
Clapping music is one of his famous pieces which features two musicians clapping - as simple as that!
Here's an old video clip of Clapping Music:
Children like looking at animated version of musical scores. In the video below, the 2 clapping parts are represented by red and blue. This is a great introduction to 2-part music. If you look at the change of sequence in the upper part carefully, you'd find out how the song is structured.