Hmmm Finnish Music..
Amorphis
Apocalyptica
Beherit
Blackthrone
Children Of Bodom ( New stuff is beyond terribad )
Cryhavoc
Demilich
Dreamtale
Ensiferum
Finntroll
Impaled Nazerene
Kalmah
Lordi
Moonsorrow
Nocturnal Winds
Northern Kings
Sonata Arctica
Turisas
Tyr
All I could think of off the top of my head.. it was late/early zzz.
Aren't Tyr from the Faroer Isalnds? Or is there a Finnish Band, that goes by the same name?
Anyway, nice list with a lot of good stuff. My personal favourites among Finnish bands are:
Nightwish, Turisas, Lordi, Stratovarius, Ensiferum, Korpiklaani and Apocalyptica. Though there might be others I have just not identified as Finnish yet, since most of the time I don't care where the music comes from as long as I like it.
Although I have noticed that, most bands I really like are from Finland, Sweden or Germany (Most of our music sucks, but when it comes to Metal we have some decent bands here).