While the science of sound can be taught by explaining the concept of sound waves and vibrations, the authors of this article focused their efforts on creating a more engaging way to teach the science of sound--through engineering design. In this article they share the experience of teaching sound to third graders through an engineering challenge that involves designing a stringed instrument. The activity described, which corresponds to first- and fourth-grade "Next Generation Science Standards," was implemented for third graders to satisfy grade 3 Indiana Science Standards. However, it can be easily modified for higher grades by incorporating more open-ended inquiry or design activities. The engineering challenge is divided into four discrete activities that took place over two sessions of 1.5 hours: inquiry, design, build, and test/evaluation. Each activity is designed to build on students' understanding of the characteristics and properties of sound. By using what they learn about sound from these activities, students are then encouraged to apply what they know about sound to complete the engineering design challenge.