The Science of Sound (2nd) This series of seventeen experiments investigates sound and its application to animals, musical instruments and communications.
http://www.galaxy.net/~k12/sound/
Sound Unit (3-5) This unit applies an interdisciplinary approach to teaching children the concept of sound. It explores a wide range of topics, including sound waves, qualities of sound, the human voice, and our sense of hearing.
http://www.coreknowledge.org/CKproto2/resrcs/lessons/398Sound.htm