A writer goes through the boxes of papers left by “Rent” author Jonathan Larson. “The cynic in me knows that Larson’s tragic death on the day before his long-labored-over Rent was about to go into previews fueled the hype that made the show ‘the breakthrough musical for the ’90s,’ as Newsweek wrote. But having been an eyewitness to the paper trail left by Larson’s perspiration and inspiration, I also know he deserved the Pulitzer and the Tonys. And the long career he never got.” Did Larson “reinvent” musical theatre? And these new musicals on Broadway merely rip-offs of Larson’s ideas?