The Florida Philharmonic is gone, a victim of the bad economy and public indifference. But, like so many other communities which have lost symphony orchestras, music fans in South Florida are holding out hope that a new ensemble will eventually rise from the ashes of the Phil. This week, the Dade Community Foundation struck a deal that makes such a revival much more likely: it’s purchasing the Philharmonic’s music library for $180,000, and storing it until a new orchestra can take it back. An orchestra’s music library is its most irreplacable asset, and building one from scratch takes years of careful purchasing, so the preservation of the library was a major priority for the musicians of the defunct Philharmonic.