On their walk home from school, twins Jane and Jim explore why sounds can be startling (like sirens), soothing (like music), or mysterious (like eerie creaking in an empty house). By coming along, young readers of What Makes Different Sounds? can learn as the twins do. They'll be introduced to the roles vibration, pitch, and volume play in how rustles, rumbles, and rat-a-tat-tats are made and transferred to their own ears. Interest Level: K-3 Reading Level: 3.5 Lexile Measure: 620 Iowa Core Science.