is a style of black metal which relies on heavy incorporation of atmospheric, sometimes dreamy textures, and is therefore less aggressive. It often features synthesizers or classical instrumentation, typically for melody or ethereal "shimmering" over the wall of sound provided by the guitars. The music is usually slow to mid paced with rare blast beat usage, without any abrupt changes and generally features slowly developing, sometimes repetitive melodies and riffs, which separate it from other black metal styles. Subject matter usually concerns nature, folklore, mythology, and personal introspection. The birth of the genre dates back to 1993 when Burzum and other contemporary bands experimented and inserted in their compositions less obsessive rhythms, creating magical atmospheres mostly inspired by the lord of the rings.