"Bergtatt", the first part of what has become known as ""The Trilogie – Three Journeyes Through the Norwegian Netherworlde"", was released during the rise of the Norwegian black metal subculture in Norway in the early 1990s. Separated from the more straightforward black metal sound of their contemporaries, Ulver incorporated elements of Norwegian folk music, utilizing acoustic guitars, droning low choirs, flutes, melody-focused songwriting and clean vocals together with fast tempos, shrieked vocals, highly distorted guitars, blast beat drumming, raw (lo-fi) recording and unconventional song structures. This earned them the label "folk metal".