Isis and Neurosis, with similar influences, created a style that relies mostly on ambience and atmosphere that would eventually be named atmospheric sludge metal or post-metal. Fusion and subgenres D-beat D-beat (also known as discore or kängpunk) is a hardcore punk subgenre, developed in the early 1980s by imitators of the band Discharge, after whom the genre is named, as well as a drum beat characteristic of this subgenre. The bands Discharge and the Varukers are pioneers of the D-beat genre. Robbie Mackey of Pitchfork Media described D-beat as "hardcore drumming set against breakneck riffage and unintelligible howls about anarchy, working-stiffs-as-rats, and banding together to, you know, fight." Emo and post-hardcore The 1980s saw the development of post-hardcore, which took the hardcore style in a more complex and dynamic direction, with a focus on singing rather than screaming. The post-hardcore style first took shape in Chicago, with bands such as Big Black, the Effigies and Naked Raygun. It later developed in Washington, DC within the community of bands on Ian MacKaye's Dischord Records, with bands such as Fugazi, the Nation of Ulysses, and Jawbox. The style extended until the late 2000s. The mid-80s Washington, D.C. Revolution Summer movement and post-hardcore scene would also see the birth of emo. Guy Picciotto formed Rites of Spring in 1984, breaking free of hardcore's self-imposed boundaries in favor of melodic guitars, varied rhythms, and deeply personal, impassioned lyrics dealing with nostalgia, romantic bitterness, and poetic desperation. Other D.C. bands such as Gray Matter, Beefeater, Fire Party, Dag Nasty, also became connected to this movement. The style was dubbed "emo", "emo-core", or "post-harDCore" (in reference to one of the names given to the Washington, D.C. hardcore scene). Thrashcore and powerviolence Often confused with crossover thrash and sometimes thrash metal, is thrashcore. Thrashcore (also known as fastcore) is a subgenre of hardcore punk that emerged in the early 1980s. It is essentially sped-up hardcore punk, with bands often using blast beats. Just as hardcore punk groups distinguished themselves from their punk rock predecessors by their greater intensity and aggression, thrashcore groups (often identified simply as "thrash") sought to play at breakneck tempos that would radicalize the innovations of hardcore. Early American thrashcore groups included Cryptic Slaughter (Santa Monica), D.R.I. (Houston), Septic Death (Boise) and Siege (Weymouth, Massachusetts). Thrashcore spun off into powerviolence, another raw and dissonant subgenre of hardcore punk. Other notable powerviolence bands include early