The science of sound is relevant to the music we hear and produce, the ways ships communicate underwater, and much more. The interactive aspect of the World Wide Web provides a fun platform for learning about sound. The websites covered in this Topic in Depth provide an overview of the science of sound, the applications of acoustics, and fun ways to learn about all of it. The Canada Science and Technology Museum provides a nice overview of the science of sound (1). The second website (2) also discusses some of the basics and also provides video and sound files to demonstrate the concepts. The third link takes you to a website that guides the visitor to various websites to get answers to some interesting questions about sound, such as What is the difference between noise and music? and how do dolphins use sound to communicate? (3). The Science Museum of Minnesota offers the Sound Site (4). For more on acoustics research areas, see some of the projects at the Acoustics Research Institute In Austria (6) such as Computational Acoustics and Digital Signal Processing. Last but not least, this website from the Exploratorium (7) takes you through some of the connections between science and music.