Ben Zander: I teach students, I teach a class at the New England Conservatory for young musicians and they come, and they are very excited to be there. And they thrilled to be at the New England Conservatory and all that. 
   But they are not so sure about how they compare to their next-door neighbors. And when they come up to play in front of people, it looks as though there is just one person there. 
   But actually there are two people. There is the person who is playing. And then there is the person who is standing beside the person who is playing, whispering in his or her ear, saying, “You haven’t practised enough!” 
   Or: “Do you know how many people play this piece better than you do?”