From 2003:
The “untheatricality” of rock music is a complicated subject about which I’ve never gotten around to writing. It’s far too complicated to go into in a short posting, but I can say that to blame the decline of the Broadway musical on rock is to mistake a symptom for the disease. What happened in the Sixties was that the old-fashioned standard-style ballad ceased to be the lingua franca of American popular music–and that nothing replaced it. Instead, our musical tastes shattered into a million pieces. After the Sixties, there was never again one kind of music to which “everyone” listened. In the absence of that kind of broad-based consensus of taste, popular music began to take a back seat in the mass media to other forms of pop culture….
Read the whole thing here.