Grindcore is an extreme fusion genre of heavy metal and hardcore punk that originated in the mid-1980s, drawing inspiration from abrasive-sounding musical styles, such as thrashcore, crust punk, hardcore punk, and trash metal. A variety of microgenres have subsequently emerged, often labeling bands according to traits that deviate from regular grindcore, including goregrind, pornogrind, and electrogrind.
Grindcore lyrics are typically provocative. A number of grindcore musicians are committed to political and ethical causes, generally leaning towards the far left in connection to grindcore's punk roots. For example, Napalm Death's songs address a variety of anarchist concerns,
… Read more in the tradition of anarcho-punk. These themes include anti-racism, feminism, anti-militarism, and anti-capitalism. Early grindcore bands including Napalm Death, Agathocles and Carcass made animal rights one of their primary lyrical themes. Some of them, such as Cattle Decapitation and Carcass, have expressed disgust with human behavior and animal abuse, and are, in some cases, vegetarians or vegans.