Materials Shoe Box 3 or 4 heavy rubber bands Pencil or pen Scissors 2" x 3" piece of cardboard folded in half Draw a circle in the center of the box lid. Cut out the circle (Adult may need to do this step) Put the cover back on the box. Wrap the rubber bands around the box so that they go across the hole. Put the folded piece of cardboard under the rubber bands as a bridge next to the hole. Strum the rubber bands with your fingertips.