Neeme Jarvi, 67, who steps down from 15 years leading the Detroit Symphony, has been appointed music director of The Hague Residentie Orchestra in the Netherlandsis. He’s already scheduled to become music director of the New Jersey Symphony next fall. “Though not of the same size and stature of the Royal Concertgebouw Orchestra of Amsterdam or the Rotterdam Philharmonic, the Residentie Orchestra is an important symphony in Dutch musical life.”