Intriqued, I went to the web page with the sound samples and discovered to my dismay that you can't really listen to the music. Somebody has inserted regular interruptions into them, so they sound like an LP with a bad scratch.

I hate it when people do that. Do they think I am going to swipe their 30 seconds of nyckelharpa and become the next Donald Trump?

An observation - the sound of the nyckelharpa is very similar to that of the Hardanger fiddle, another Scandinavian specialty.