The document outlines the evolution of rock music genres from the early 1960s to the mid 1970s. It starts with pop rock and psychedelic rock emerging in the mid 1960s followed by garage rock, progressive rock, art rock and hard rock in the late 1960s. Glam rock and heavy metal developed in the early 1970s followed by stadium rock (arena rock) in the mid 1970s. Various iconic artists and albums are listed that helped define each genre during this period.