Ole Juul, I was in a band that played a suite of traditional Danish dance tunes. Traditional Danish songs and dances were collected by some of the people that you mentioned above. Other than playing the tunes, I don't know too much about them, but here is a link
Danish Traditional Music. I do know that, like here in the US and in the UK, the music has been preserved and revived.

For those of us who care to bicker about it, here and in the UK, at least, it has created a question about whether the people who play this revived music are part of "the tradition" or whether "the tradition" ended long ago and they are merely re-creationists. Added to that is a question about whether there are other contemporary "living traditions"( and, if so, what they might be).

This question is tirelessly rephrased and debated, mostly in online forums like this one. Perhaps "tirelessly" is not completely accurate, some of us do get tired of it:-)