Leo, a curious boy, creates musical instruments from recycled materials. He discovers how long tubes make low sounds and short tubes make high sounds (pitch), and how rubber band tension affects sound, demonstrating sound wave science (Science). He designs and builds these instruments (Engineering), uses everyday items creatively (Art), and instinctively compares sizes and sounds (Math). The story highlights creative problem-solving and hands-on learning through a STEAM lens. Ideal for ages 2-4.