This informational text is descriptive in word, photo, and charts. It not only gives a general overview of the workings of the ear and brain together, but also gives a fairly thorough explanation of the physics of sound. It would be appropriate not only for the middle but also high school level student wishing for general knowledge, and might be useful as preparation for further research. However, the age of the text leads one to believe that other sources should also be read. ( )