For Polska,

We enjoy Scandi dancing, and we were listening to some wonderful music, I think by Jonsonlinjen, in which the free reed instrument was an antique reed organ. The cover has a photo of them carrying the instrument around. Very nice sound, and very different from the various accordion flavors. Also, at the Buffalo Gap dance workshop one of the musicians had a very nice Wheatstone English concertina which she used to wonderful effect. So there are all sorts of possibilities for free reeds in Scandinavian dance music.

John