This document summarizes the evolution of various rock music genres in the 1970s. It describes how blues bands in England evolved into early metal bands with distorted guitar sounds and screaming vocals. It also discusses the rise of progressive/art rock bands that experimented with classical music influences and longer song structures, as well as the emergence of punk rock bands that reacted against over-produced disco with a rawer amateur sound. Additionally, it outlines the development of rap/hip hop from influences like Jamaican DJs and beat poetry in the Bronx.