Conductor David Zinman resigned the music directorship of the Baltimore Symphony five years ago, unhappy with what he called the orchestra’s increasingly conservative direction. At the time, many observers assumed that Zinman would never again agree to lead an American orchestra, that he was just too disgusted with the place of the arts in his native country. But now, with the Pittsburgh Symphony Orchestra revving up its search to replace outgoing director Mariss Jansons, Zinman is apparently willing to consider a return to the States. “I told them that it really depends on who the new executive director is and who the new board president is,” he says. “Then I would be open to talking about it.”