David Hajdu is the music critic for "The Nation" and a professor at the Columbia University Graduate School of Journalism. Before joining "The Nation" in January 2015, he served for more than ten years as the music critic for "The New Republic". He is the author of three books of narrative nonfiction and and one collection of essays: "Lush Life: A Biography of Billy Strayhorn" (FSG, 1996), "Positively 4th Street: The Lives and Times of Joan Baez, Bob Dylan, Mimi Baez Farina and Richard Farina" (FSG, 2001), "The Ten-Cent Plague: The Great Comic Book Scare and How It Changed America" (FSG, 2008)...