Square dance was popular before the 1920s. It was before the genre of "country" was called "country", and definitely before either radio or the phonograph. I think you can probably also quote a big chunk of song lyrics under fair use. Further, recording of folk songs (which square dance comes under) do not give a claim to the song itself to the recorder. It's like someone recording a Christmas carol; they have the rights to that particular recording, but not to the carol itself.