This document discusses the evolution of punk rock into post-punk and other genres from the late 1970s to 1990s. It outlines how punk became more experimental through post-punk bands that applied punk's DIY ethos to different musical styles. American hardcore emerged in the 1980s as a faster, more abrasive punk variant. Grunge then emerged from the Seattle music scene in the late 1980s, combining punk attitudes with slowed-down, melodic rock. Riot grrrl feminist punk also emerged in the early 1990s as a response to the male dominance of grunge. The document analyzes the musical styles, industries, and social contexts that defined these punk subgenres and scenes.