 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.