Mammut

This is an Icelandic band that isn't particularly well known; I think all the members are really young.  The music is pretty hard rock for the most part, and all the vocals are in Icelandic.  The songs have a dark undertone.  Of course I can't understand any of the lyrics, but a lot of their stuff is still really compelling.  Check out this video of a live performance of one of their more awesome songs.  They all look like teenagers.  The studio version of this song is unbelievable.  The band is worth checking out if you aren't opposed to some harder rock (and non-English lyrics).