I don’t know much about the populat music of that time. I guess leftover music of the civil war. No jazz influence yet - no tin pan alley. Traditional and folksy, still based on German and English folk. Irish trad (like O’Carolan) would be rising, especially in the cities. I think Captain O’Neill was assembling his collection around that time in Chicago. Jigs And reels. I know (and like) those tunes.