Have you ever seen music? I mean really SEEN it. I'm not talking about musical notes on a page, or even someone playing an instrument. Let me explain. My friend Sue is a sign language interpreter, and the other night I was at a concert in a church, and she was interpreting. There were times when I found it hard to decide whether to focus my attention on the performers or Sue. She not only has a way of translating the lyrics sung by the artist into hand gestures, but she somehow captures the essence and feeling of the music into her signing as well. She is so graceful and expressive, it's …