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Rock is a broad genre of popular music that originated as "rock and roll" in the United States in the late 1940s and early 1950s, developing into a range of different styles from the mid-1960s, particularly in the United States and the United Kingdom. It has its roots in 1940s and 1950s rock and roll, a style that drew directly from the genres of blues, rhythm and blues, and from country music. Rock also drew strongly from genres such as electric blues and folk, and incorporated influences from jazz and other musical styles. For instrumentation, rock is centered on the electric guitar, usually as part of a rock group with electric bass guitar, drums, and one or more singers. Usually, rock is song-based music 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. Rock was the most popular genre of music in the U.S. and much of the Western world from the 1950s to the 2010s.

Rock musicians in the mid-1960s began to advance the album ahead of the single as the dominant form of recorded music expression and consumption, with the Beatles at the forefront of this development. Their contributions lent the genre a cultural legitimacy in the mainstream and initiated a rock-informed album era in the music industry for the next several decades. By the late 1960s "classic rock" period, a few distinct rock music subgenres had emerged, including hybrids like blues rock, folk rock, country rock, Southern rock, raga rock, and jazz rock, which contributed to the development of psychedelic rock, influenced by the countercultural psychedelic and hippie scene. New genres that emerged included progressive rock, which extended artistic elements, and glam rock, which highlighted showmanship and visual style. In the second half of the 1970s, punk rock reacted by producing stripped-down, energetic social and political critiques. Punk was an influence in the 1980s on new wave, post-punk and eventually alternative rock.

From the 1990s, alternative rock began to dominate rock music and break into the mainstream in the form of grunge, Britpop, and indie rock. Further fusion subgenres have since emerged, including pop-punk, electronic rock, rap rock, and rap metal. Some movements were conscious attempts to revisit rock's history, including the garage rock/post-punk revival in the 2000s. Since the 2010s, rock has lost its position as the pre-eminent popular music genre in world culture, but remains commercially successful. The increased influence of hip-hop and electronic dance music can be seen in rock music, notably in the techno-pop scene of the early 2010s and the pop-punk-hip-hop revival of the 2020s.

Rock has also embodied and served as the vehicle for cultural and social movements, leading to major subcultures including mods and rockers in the U.K., the hippie movement and the wider Western counterculture movement that spread out from San Francisco in the U.S. in the 1960s, the latter of which continues to this day. Similarly, 1970s punk culture spawned the goth, punk, 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, sex, and drug use, and is often seen as an expression of youth revolt against adult consumerism and conformity. At the same time, it has been commercially highly successful, leading to accusations of selling out.