You can install a software called "Format Factory" in your computer, which has a video format conversion function, you can convert mp4 format to pmvb or other formats. You can also convert the square dance video into audio files, that is, to extract the dance music, so you do not have to go around to find the music, it is very good. Might as well try it.
I first helped you to convert a song "Mountain Red" sent to your email, you see if it works.