Rock music

Rock music is a genre of popular music. It developed in the late 1900s, chiefly in the United States. It originally started in the 1940s and 1950s with the start of rock and roll. "Rock and roll" grew out of R&B (Rhythm & Blues) and country after the electrification of the guitar (and music in general) in the 1940s. Rock has a lot in common with other genres like blues and folk. It has influences from jazz, classical, and other music genres.

Rock music usually uses the electric guitar, bass guitar, a singer, and the drumset. It has a 4/4 beat and it has verse-chorus form. Rock music has also helped to spread cultural and social movements. This led to large sub-cultures including modernists and rockers in the UK and the "hippie" culture that spread out from San Francisco in the US in the 1960s. Rock music has the same folk tradition as the protest song. Rock music has been involved with political activism. It has also spread awareness for race, sex, and drug-use issues. It is often seen as an expression of youth revolt against adult consumerism and conformity. 

However, rock has become really varied since the 1950s and it is hard to say what its lyrics are "mostly" about. They can express romantic love, or comment all of global society. Rock music does place a focus on musical skill and live performance. By the late 1960s, rock had spread all across the United States and across the Atlantic to Great Britain. "Rock n roll's" influence in local music genres in these places created hybrids like blues rock, folk rock, country rock, jazz-rock fusion, and psychedelic rock By the 1970s progressive rock, glam rock and heavy metal began to become popular. Progressive rock uses symbolic lyrics and  long instrumental sections. Glam rock focuses on showmanship and what you can see. Heavy metal focuses on raw emotion instead of technical skill.  Punk rock became more popular in the second half of the 1970s. It is inspired by other types of rock, as well as 1970s youth counterculture. Punk rock is a noisy type of rock music with political and social critiques. Punk rock influenced other sub-genres in the 1980s, including New Wave, post-punk and later alternative rock. From the 1990s, alternative rock (or "Alt Rock") became the most popular type of rock music. Alt Rock includes grunge, Britpop, and indie rock. Since the 2000's, the Rock-'n'-roll Hall of Fame in Cleveland Ohio has inducted increasingly varied artists. Philosophically, is increasingly difficult to say exact what Rock Music even is.  

Artists
 Simon & Garfunkel
 Sixpence None the Richer
 The Moody Blues
 The Brian Jonestown Massacre
 The Velvet Underground
 The 13th Floor Elevators
 Creed
 Memento
 Kutless
 My Chemical Romance
 The Red Jumpsuit Apparatus
 Hawthorne Heights
 The Golden Republic
 Gym Class Heroes
 Secondhand Serenade
 Matchbox Twenty

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