PHILADELPHIA — If only the American symphony orchestra could be a bit more like Netflix. As the recorded sounds of Philadelphia’s Curtis Institute orchestra last weekend poured through speakers and video of instrumentalists glowed on 18-foot-tall screens, you had the sense of an old institution reaching for, if not the future, at least one possible future. Yes, Netflix may be having problems of its own — it’s losing customers in droves — but the streaming service has cemented the idea that people now expect to get their entertainment when they want it. Orchestras and other performing arts gro…
