This song was first popular on the internet under Leek Spin, but I found the original group to be nicer to watch, Loituma- Leva's Polka, even though I don't understand it I find it very fun to listen to, very catchy.

https://www.youtube.com/watch?v=1ygdAiDxKfI

The song takes the point of view of a young man and Ieva/Eva/Eeva in Finnish, who sneak away to where everyone is dancing to a polka, and dance all night.

Enjoy....