Somewhere, in the middle of the fifth song, in the seventh scene, near the end of the first act, I found myself staring down the barrel of a gun. I had brought my wife and children out on a clear blue February day to the theater downtown. The sun set behind us as we shuffled through the park holding ice cream in our shivering fingers and we shared giddy laughter that bubbled between us and echoed off the ice-covered trees. We were in high spirits. Nothing could possibly ruin this evening. We were on our way to a special Sing-a-long presentation of the Broadway musical The Sound of Music. My girls knew the story well (although, they were disappointed to learn that Julie Andrews…