By extreme metal I mean any thing in the thrash, death, or black metal genre. Me personally as you can probably guess by my username I like Bathory the most. Bathory has been fairly consistent in comparison to other extreme metal acts of their time having only two particularly poor albums (Requiem and Octogon) and also they are major pioneers in both black metal and Viking metal. I love how versatile they were going from their raw motorhead influenced debut to a more majestic and atmospheric beauty such as Twighlight of the gods. A lot of your less well rounded people will not be able to respect such changes in style but I like a band who is willing to try different things especially one who generally does such a damn good job. Some of Bathorys albums took getting used to such as the Return which at first I simply could not get into but one day I fell in love with it and now consider it a masterpiece of its genre. My fav album by Bathory is ofcourse Blood, fire, death because its a best of both worlds as it shoes the transition between black metal and Viking metal plus the title track is imo the bands most epic piece of work.