“Twenty-one years after disappearing in a robbery, the Dallas Symphony Orchestra’s circa 1727 Stradivarius violin is back in town, newly reconditioned and ready for a new solo debut.” The instrument, purchased by the DSO in 1978 for its concertmaster to use, was stolen in a burglary in Europe in 1985. No one saw it again until last year, when a retired DSO violinist spotted it in an auction catalog.