You must also remember that Ulver were very young when they first started out. Apparently Garm was only 16 years old when Vargnatt was recorded, and when your a teenager your always filled with anger and what not. As you get older you change and you start to like new music. It's happening to me as I've pretty much got my fill of heavy metal after listening to it for over 10 years now. I barely even listen to any metal anymore and I'm only 23 years old. I'm guessing the same thing happened with Garm. He heard a band that wasn't metal, he liked it, and wanted to make something similar. He changed and everyone changes their tastes in music and other such things eventually.