The first instrument on top of the drums is jaw harp, also called Jew's harp or mouth harp. This small instrument has been widely used in many cultures around the world.

I first head these lyrics performed by Tellu Turkka and Suden Aika, back in the 1996. But I'm not entirely sure if the lyrics were written for that project, or are directly from folk tradition. Anyhow, the verse is written in old format of Finnish shamanistic rune singing.

I think I had been listening to a couple of tracks by Omnia, but I really had no idea that they've done a version of "Auta luonto" - thanks for sharing!

And speaking of Kantele - this is how Finnish schoolkids rock it:
https://www.youtube.com/watch?v=7UmlWfylyCY

EDIT: That Omnia song reminded me of another song - but since I couldn't remember the name of the band nor the name of the song, it took me a while to find it. But here it is; Faun singing an old finnish folk verse - reading the lyrics it seems like a hunter's ritual, addressing the King of the Forest, asking for good luck in hunting: https://www.youtube.com/watch?v=w47NaA1rgFM

Ah, and another group definitely worth mentioning is Myllärit - they are from Russian Carelia, and here is their version of ancient Finnish "Greeting the King of The Forest":
https://www.youtube.com/watch?v=aSFdB1YcP9k