Demether is a Folk / Goth Metal band from Serbia, formed in 2002, their style is on the lines of Nightwish. They have released only 2 albuns to date, both very good. Their sound is a mix of operatic vocals, fast Heavy Metal-guitars, sometimes Baroque and Medieval melodies, loud drums, and the predictable male guttural vocals here and there.
Below is a couple of videos of theirs. Enjoy!More info: Myspace