Classically Training: What does the arm waving mean?

Conductors have an important job. They start the music, stop the music, set the tempo, and help shape the sound of a piece. And they do all of this with their arms! However, every conductor does the arm-waving part a little differently. So how do musicians know what to do? This week, our host sits down with conductor Hannah Schendel to help demystify the movement that creates our music.