(Hopipola is a great song)
http://www.youtube.com/watch?v=ZzbX3EgGoXQ
http://www.youtube.com/watch?v=pV9Z4gP3KkI
The song is so long they had to split it in 2 parts. Anyway, Moonsorrow is a folk/viking metal band, but just listen to it with an open mind. Folkloric instruments and chants are used as well as electric guitars and screams. You won't be disappointed. It's about the decay of nature because of us.
If you really can't stand anything metal related, this is actually the 3th part of the song, no guitars, drums or screams, only folkloric instrumens and singing.
http://www.youtube.com/watch?v=LLAKcS-BUMg
I almost never listen to this kind of music anymore, but this is just good (alternative) music.