"The music's kind of oozing out of not just his hands, but his whole body," Boston Symphony managing director Mark Volpe says of the orchestra's new music director, Andris Nelsons. (Marco Borggreve/Boston Symphony Orchestra) Andris Nelsons is a bear of a man. The 35-year-old Latvian conductor, who will become the Boston Symphony Orchestra's youngest music director in more than a century, is over 6 feet tall, and when he stands on the podium, he moves. "Through conducting," Nelsons says, "you express through your arms, through your face and even the body, what you want to tell, so the musicians of the orchestra understand."