How do opera singers sustain those high C's in "La Fille Du R'giment"? Is a birdsong music? These are but a few of the many questions explored, and answered, on this delightful site. Visitors can consider these and other queries through interactive exhibits, a "questions" section, and movies offered up by the Accidental Scientist Music site, created by staff members at the Exploratorium in San Francisco. To start, visitors should browse through the "Online Exhibits" area. Here they can join an online drum circle, explore the world of step dancing, and even create their own remixes. The "Questions" area provides multimedia answers to queries that include "Why does some music give me goose bumps?" and "Why does sad music sound sad?" Finally, the "Movies" area contains a selection of short films that cover everything from the tuning of musical instruments to the blues.