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Rock music is a genre of popular music that originated as "rock and roll" in the United States in the 1950s, and

developed into a range of different styles in the 1960s and later, particularly in the United Kingdom and the United

States. It has its roots in 1940s' and 1950s' rock and roll, itself heavily influenced by rhythm and blues and country

music. Rock music also drew strongly on a number of other genres such as blues and folk, and incorporated

influences from jazz, classical and other musical sources.

Musically, rock has centered on the electric guitar, usually as part of a rock group with electric bass guitar and

drums. Typically, rock is song-based music usually with a 4/4 time signature using a verse-chorus form, but the

genre has become extremely diverse. Like pop music, lyrics often stress romantic love but also address a wide

variety of other themes that are frequently social or political in emphasis. The dominance of rock by white, male

musicians has been seen as one of the key factors shaping the themes explored in rock music. Rock places a higher

degree of emphasis on musicianship, live performance, and an ideology of authenticity than pop music.

By the late 1960s, referred to as the "golden age" or classic rock period, a number of distinct rock music subgenres

had emerged, including hybrids like blues rock, folk rock, country rock, and jazz-rock fusion, many of which

contributed to the development of psychedelic rock, which was influenced by the countercultural psychedelic scene.

New genres that emerged from this scene included progressive rock, which extended the artistic elements; glam

rock, which highlighted showmanship and visual style; and the diverse and enduring subgenre of heavy metal,

which emphasized volume, power, and speed. In the second half of the 1970s, punk rock reacted against the

perceived overblown, inauthentic and overly mainstream aspects of these genres to produce a stripped-down,

energetic form of music valuing raw expression and often lyrically characterised by social and political critiques.

Punk was an influence into the 1980s on the subsequent development of other subgenres, including new wave,

post-punk and eventually the alternative rock movement. From the 1990s alternative rock began to dominate rock

music and break through into the mainstream in the form of grunge, Britpop, and indie rock. Further fusion

subgenres have since emerged, including pop punk, rap rock, and rap metal, as well as conscious attempts to

revisit rock's history, including the garage rock/post-punk and synthpop revivals at the beginning of the new

millennium.

Rock music has also embodied and served as the vehicle for cultural and social movements, leading to major sub-

cultures including mods and rockers in the UK and the hippie counterculture that spread out from San Francisco in

the US in the 1960s. Similarly, 1970s punk culture spawned the visually distinctive goth and emo subcultures.

Inheriting the folk tradition of the protest song, rock music has been associated with political activism as well as

changes in social attitudes to race, and is often seen as an expression of youth revolt against adult consumerism

and conformity.

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