It isn’t often that Ochs, who died four decades ago and is mostly unknown to those born since the 1970s, gets even a brief moment of mainstream recognition. Yet as we enter the Trump era, and as a new mass protest movement begins to take shape, his music would be worthy of a revival. Taken together, his songs offer an exceptionally compelling tour of the deepest questions currently confronting liberals — questions about democracy, dissent and human decency in a grim political age.