At the 2016 New Yorker Festival, a panel of experts from across the political spectrum discusses the hypothetical first term of President Trump. And Atul Gawande, a surgeon and self-avowed music nut, talks with Andrew Bird, whose music Gawande plays in the operating room. Bird discusses “Puma,” a song about the radiation therapy his wife was given after she had been diagnosed with thyroid cancer, and performs two numbers live.