I'm going to have to agree with those that say the production shouldn't be changed on some albums(such as Emperor's early work). The appeal of Nightside was more than just the music, it was the atmosphere that it created. If you're not someone that listens to alot of black metal, you won't get it, but to people that do, you know that the atmosphere is a major part of the music. As good an album as Prometheus was, it was lacking in atmosphere. The same for what was said about Nattens Madrigal. If you take away the harsh production, then you're ruining the music. Instead of an excellent black metal album, you just have something generic.