Why does music matter so much to so many of us? Some, like Stereophile's readers, go to great lengths to reproduce it in their homes with accuracy and impact, and build libraries of their favorite works. Others, like my daughters, don't care much about equipment, but find it hard to spend more than five minutes in a car without listening to music. We go to concerts, play instruments, hum tunes, sing. Why? Why does music seem to speak to so many more of us than do, say, painting, sculpture, poetry, architecture, or even literature?