The Polar Express is about faith, and the power of imagination to sustain faith. It's also about the desire to reside in a world where magic can happen, the kind of world we all believed in as children, but one that disappears as we grow older.
Music is more of a hobby to me than my hobbies, if that makes sense. I love music; my dad and brother were very musical, and music just happens to be one of my hobbies that became my vocation.