The science of music may not be something most people think to wonder about, but for those who do, this lovely online collection of exhibits and activities provided by the Exploratorium will be of great interest. Visitors can explore the science of music through these different exhibits, short movies, and questions. Some of the thought-provoking questions which are answered through short presentations include, "Why do some songs get stuck in my head?� and "Why does some music give me goose bumps?�. The real treat on the site is the section of interactive exhibits, which include a chance for visitors to remix a "step" song, using a variety of hand-claps, foot-stomps and other rhythmic devices. Visitors can also view short films that talk about "steppers" music, the blues and the importance of tuning.