Michael Schneider Variety Editor at Large We’ve all made the “Cop Rock” jokes. The Steven Bochco musical drama, which premiered in fall 1990, was a big swing: marrying original music with procedural storytelling. It was a colossal flop that we still talk about three decades later, and a reminder that musicals are hard. Music has been a part of the TV landscape going back to the 1950s and shows like “Your Hit Parade.” But few series have successfully integrated regular music performances into their storytelling: “The Monkees” and “The Partridge Family” worked in the 1960s and ’70s. “Fame” did it in the early ’80s. And then “Cop Rock” scared people off the concept.