This PBS Web site is the online companion to the Nature documentary "Song of the Earth," hosted by David Attenborough. The program explores the elemental purpose of music and offers a fascinating look at the connection between animal sounds and human music. The site includes two detailed lesson plans that integrate science and language arts, designed for grades 9-12. Learning objectives include conducting research on animal behavior, applying scientific methodology, synthesizing information to create presentations, and more. The main Song of the Earth Web site has other features -- such as a list of related links and a photo essay of animal music -- that would make excellent additions to classroom activities.