Demystifying Conducting: The Connection Between Gesture and Music | The New York Times

I know this is a little off-topic, but I don't care much. I thought it should be interesting to watch for any musician and music lover. This is also fun to watch, because the technologies used allow to visualize the idea and importance of gestures in music 

In fact, strictly speaking, musical gesture is not off-topic. Gesture is part of music, and what makes music embodied, human and expressive. Alan Gilbert, music director of the New York Philharmonic, demonstrates and discusses the role of a conductor, and how every little movement is meant to mean something for the musicians.

Well, maybe you are not a conductor, but you are the "conductor" of your instrument, so the same rules applies!