In case my recent admission that I first heard Vivaldi on the Kramer vs. Kramer soundtrack didn’t give you a big enough clue, I’ll confess that I’m a commoner who always comes to classical music in a somewhat sideways manner. I discovered the great American composer Aaron Copland when a version of his heart-in-throat Fanfare for the Common Man served as the opening theme for some Saturday TV sports show (and, no, I didn’t watch that—...