Stevie Wonder famously sways his head left and right when he's performing on stage. I've always thought that it was a listening technique linked to his blindness; I assume you can locate sounds easier that way, but maybe he's listening for different aspects of the sound mix. I don't know whether he's ever discussed this.
So, is there anything that non-blind people can learn from this technique? Should we all be swaying on stage while performing? Should we be swaying in our studios while mixing? What aspect of our musical hearing would be improved?