Cleo and the Story of Sound follows Cleo, a young musician with a curiosity about how sound works. When she discovers a magical portal through her violin, she's transported to Soundland, a whimsical world where sound comes to life. Alongside new friends like Echo the bird and Melody the wind, Cleo embarks on an adventure to understand sound waves, vibrations, and how we hear sounds. With each new discovery, Cleo learns how music and science are connected, introducing young readers to the wonders of sound in an engaging, musical way.