Post-metal and post-rock, honestly compared.

Post-rock, a term coined by critic Simon Reynolds in a 1994 review of Bark Psychosis's Hex, means using rock instruments for non-rock purposes: guitars as texture and timbre rather than riffs and power chords, usually without much distortion-driven heaviness. Post-metal takes that same appetite for long-form dynamic builds but keeps metal's weight and distortion at the centre, growing out of Neurosis's fusion of sludge and atmosphere and effectively defined as a distinct style by Isis's Oceanic in 2002.

Honestly, the boundary is blurry and both labels get applied to some of the same bands, including Cult of Luna. Sludge metal proper is doom-slow, thick and aggressive; atmospheric sludge stretches that same weight into longer, more spacious, more melodic builds closer to post-rock; post-metal is often used almost interchangeably with atmospheric sludge by different writers. This page keeps the three as separate rows because the traits are genuinely distinguishable, while being upfront that the labels overlap in practice.

The onomatopoeia is widely credited to Meshuggah guitarist Fredrik Thordendal, who has described it as arising from a fan mishearing him describe a guitar tone while drunk; the word then spread through Meshuggah fan forums before Periphery's Misha Mansoor helped organise a wider scene around the sound. Meshuggah guitarist Mårten Hagström later called the whole episode “a drunk misunderstanding,” and even musicians closely associated with the style have argued djent is a technique or a scene more than a strict genre.

Both camps claim it, genuinely. Spiderland (1991) is cited across post-rock histories as a key precursor to the genre's mood and dynamics, and cited across math-rock histories (alongside Don Caballero and Shellac) for its angular, unusual-meter guitar interplay. This page treats that dual claim as a real illustration of how blurry these genre boundaries are, rather than forcing the record into one row to manufacture false precision.

Blackgaze, pioneered by Neige of Alcest in the mid-2000s, keeps black metal's shrieked vocals, blast beats and tremolo-picked guitar but fuses them with shoegaze's wall-of-sound guitar texture and a warmer, dreamier production style, trading raw misanthropy for a more melancholic, melodic mood. Deafheaven's Sunbather (2013) is the album most often credited with bringing that fusion to a much wider, more mainstream audience.