By now, it has been making the email and Facebook rounds many times over: The Opera Company of Philadelphia hides in the Center City Philadephia Macy’s on Saturday, October 30, and during the height of the busy shopping day breaks into an “impromptu” performance of the Hallelujah chorus from Handel’s “Messiah.” It was a “Random Act of Culture,” funded by the Knight Foundation as a campaign to bring “classical artists out of the performance halls, into the streets – and our everyday lives.” The only reason we know about it—and have “seen” it—is because it was posted on YouTube. And in the weeks since it has gone, as they say, viral. Three years ago, I wrote in a more academic venue about the experience of Radio City Music Hall’s Christmas Spectacular as an experience of cultural “transgression.” It seems that a similar…