Bella’s most prized possession, a Mozart doll, lays in the center of her bed, surrounded by a small herd of Build-A-Bear stuffed plushies, American Girl dolls, and stuffed zoo animals. He lays stiff and unyielding in the throng of plastic and plush, wearing a sponge-like grey wig, and a red suit with white ruffles. When his key is turned, he plays Eine Kleine Nachtmusik, translated as “A Little Night Music.” And though intended as a light-hearted serenade, not a lullaby, its playful notes comfort Bella. ...

I’ve just started my 45th year teaching at Berklee, and, with 50 years in front of classrooms (earlier teaching stints at Indiana University and the University of Notre Dame) someone might ask, “Isn’t that enough? When are you going to…