'''Rock music''' is a style of [[music]] derived from the blues, characterised by a prominent [[drum]] beat in 4:4 time, accompanied by electric bass [[guitar]] providing the harmonic underpinning for the melody of electric guitar and vocals.
[[Elvis Presley]] and [[Buddy Holly]] were early pioneers of Rock in the late 1950s, as were the [[Beatles]] and [[Rolling Stones]] throughout the 1960s. During the aforementioned 1960's an experimental type of rock known as psychedelic rock became popular. In the 1970s 1970's it was replaced by progressive rock which removed a lot of the influence that psychoactive drugs had had on psychedelic rock and replaced them with influences from other musical genres such as jazz. Later progressive rock started to decline in popularity, and a new style called [[Punk rock]] became popular. In the 80s, [[New wave]] showed up and became popularas well. By the latter half of that decade, [[Glam rock]] had stultified into MTV-friendly "hair metal", and the stage was set for Nirvana and the Seattle scene, a darker and heavier rock subgenre known as [[Grunge]]. By 1994 and the death of [[Kurt Cobain]], grunge had changed into the stable formula of alternative rock that continues to be popular today.
Rock music sometimes includes lyrics that promote drug use, sex, and violence, but the same is true for other forms of music as well.<ref>[http://www.ericbarger.com/articles/RockMusic.html]</ref> <ref>[http://www.temcat.com/Chritian-Living/battle.htm]</ref> Some say that anti-Christian sentiment is the driving force behind Rock music. <ref> [http://www.jesus-is-savior.com/Evils%20in%20America/Rock-n-Roll/nature.htm The Nature of Rock Music] </ref>