From Plank Road Publishing
This cumulative "sound song" focuses on caring for the earth. As with all our sound songs, the idea is to introduce various sounds or bits of melodies one at a time or in groups, building to a certain point, then un-building back to the base. In this case, the base is a piano and synthesizer pad which plays through the eight measures fifteen times on the recording. It's an easy way to help students learn part singing.
You can use the form we suggest, or you can adapt it for your own version. In fact, we encourage you and your students to come up with alternate ways of layering and unlayering the parts.
We have chosen four non-pitched percussion instruments: small triangle, guiro, claves, and small shaker. These can also be altered or added to for your situation. (from Music K-8, Vol. 6, No.4)