Science: What is music?

"What is music? Is birdsong music? How about the tap-tap-tap of a hammer, or the wail of a creaking door? Is playing a garbage can different than playing a drum?...Explore the science of music with us, through these online exhibits, movies, and questions. Along the way, you can compose, mix, dance, drum, experiment, and above all...listen." -- from the website. <http://www.exploratorium.edu/music/>