Song playlists at presidential campaign rallies can be about more than music — they can reflect a candidate’s values, political platform, identity and target audience. We examine the role of these playlists in the 2020 campaign. Guest: Astead W. Herndon, who covers national politics for The New York Times. For more information on today’s episode, visit nytimes.com/thedaily.  Background reading:The Times analyzed playlists used by nine Democratic candidates and President Trump to see how they help set the tone for each campaign. Turn your sound on.