I'm a Finn. Most of the bands here are totally unfamiliar to me.
But you should definitely check out Pekko Käppi. Because of him, an ancient Finnish instrument called jouhikko (distant cousin of the violin) has been rediscovered. He's been doing all kinds of stuff with it from traditional folk to punk music and beyond.
Pekko Käppi - Vuonna '86 - Album Out Now!