MUSIC IS Music is magical. Whether it is fast or slow, loud or soft, haunting or uplifting, music makes our world a richer place. Some people dance to it, some write, play or sing it, and others just listen. Music's power is that it touches everyone in different ways. It can be enjoyed by a crowd or by one person alone; it can mark grand occasions or bedtime.   We're so used to having music in our lives that we may not always notice how it affects us. In this lilting tribute, Lloyd Moss and Philippe Petit-Roulet lead us to think about how different the world would be if we didn't have music.