Two of the protesters that entered the hall led music director Yannick Nézet-Séguin to slam his baton on the podium and walk off the stage. Some musicians began to leave, too, before the protesters, who were loudly booed by the audience, were forcibly removed. After the 10-minute disruption, the orchestra’s interim co-president, Matthew Loden, told the audience: “We live in an age where dissent is important. It matters. It should be heard. But the sanctity of the concert hall should be respected.”