Korven Kuningas by Korpiklaani. They're a really obscure Finnish folk metal band, you've probably never heard of them.
/hipster
In all seriousness, though, their first two albums were excellent, combining elements of classic headbanging metal and genuine musicianship with Finnish folk tales and fiddles.
Korven Kuningas was an hour and 13 minutes of music that all sounded the same and was mostly in Finnish. Guys, I get that you're a Finnish band and I don't mind it when you decide to speak in Finnish (Keep on Galloping from Koren Kuningas is still good despite 90% of it being incomprehensible to my Canadian ears), but when your albums so far have been almost entirely in English, it's not the sort of thing you just go around changing.
And I'm not going to get into the title track, which I thought was going to be a 22-minute epic the likes of which I had not heard since Niflheim by Adagio (obscure French band because that's how I roll). It ended up being a song like any other one on the album, but with 15 minutes of THE SAME THREE DRUM NOTES REPEATED UNTIL THE END OF THE SONG.
Good God did that ever annoy me.
EDIT: Hah! My 42nd post and it's about obscure European metal. Awesome. Read more Douglas Adams if you don't get why 42 is a significant number.