What exactly is it that a conductor does?
I'm watching the movie "The Hidden Face". (seriously great movie). The primary actor is a conductor. What exactly is it that a conductor does? All of the orchestra has the music, so each should know their part. I'm confused as to why the conductor is considered such a genius, unless he/she is the author of the music and has a certain way of interpreting it. Even so, I don't get it. Forgive my ignorance. But please explain.