At Wolf Trap, NSO and a talented young pianist get lost in the sound system

Music under the stars is a long-standing summer tradition for orchestras. Different orchestras, of course, interpret it in different ways. At Tanglewood or Ravinia, you can hear the Boston and the Chicago symphony orchestras, respectively, play straight-ahead orchestral repertoire. At Wolf Trap, by contrast, the National Symphony Orchestra's summertime series, NSO @ Wolf Trap, has evolved into a heavily pops-oriented array of sing-along movies and video-game extravaganzas. There's only a small s...