Music, Meaning, and Emotion

What distinguishes music from non-music? The world is replete with sound -- both man made sounds and the sounds of nature. Many of these sounds are quite beautiful -- the cries of various animals, the sound of the ocean, the whistling wind, the human voice, the majestic boom of the space shuttle as it rockets into space. But only a few of the sounds with which the world is replete count as music. Is there anything deep to say about what distinguishes music from non-music?