When James Levine officially takes over the podium of the Boston Symphony Orchestra a month from now, the musical landscape of the city will be changed, for better or for worse. The BSO “has occupied a leading place among world orchestras for most of its existence, but it has been a while since it was consistently and unquestionably at the very top of the heap. The board, players, and public want that back, and many believe that Levine can lead the orchestra there.” Still, success in one city (New York, in this case,) doesn’t always translate into success in another, and there are still many uncertainties surrounding the new maestro.