Use a small, sturdy cardboard box. Cut away one side of the box almost to the edges but leaving a small triangular area near each corner to preserve the strength of the box. Using different widths and lengths of elastics, stretch them around the box and across the cut-out section. Pluck the elastics. Vary the tautness of the elastics.
Students become actively involved in their learning as they discover for themselves.
Experiment with one or more of the following activities to discover what causes sound. Caution students to think about safety when working with materials. Strike a tuning fork and then gently touch its prongs against the side of a glass. Strike a tuning fork. Hold it near your ear.