The style has extended until the late 2000s. The mid-80s Washington, D.C. 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). 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 Man is the Bastard and Spazz. Grindcore is an extreme genre of music that began the early to mid-1980s. Grindcore music relies on heavy metal instrumentation and eventually changed into a genre similar to death metal. Grindcore vocals, according to AllMusic, range "from high-pitched shrieks to low, throat-shredding growls and barks". Grindcore also features blast beats; according to Adam MacGregor of "Dusted", "the blast-beat generally comprises a repeated, sixteenth-note figure played at a very fast tempo, and divided uniformly among the kick drum, snare and ride, crash, or hi-hat cymbal." The band Napalm Death invented the grindcore genre; their debut album "Scum" was described by AllMusic as "perhaps the most representative example of" grindcore.