Along with their contemporaries in the civil-rights movement, these hippies, for better or worse, established the image of protest in this country. They set the template for what it should look like, what sacrifices it should entail, who should do what and why. Country Joe McDonald and his fellow-folksingers, in particular, set an expectation that moments of great political unrest in this country would come with a soundtrack, preferably one involving a lot of acoustic guitar. This, for the most part, has not materialized during the Trump era, outside of a few stirring but notably nostalgic attempts by artists such as Bruce Springsteen, who wrote the song “Streets of Minneapolis” about the killings of Renee Good and Alex Pretti.