Rock is a broad term that groups together a variety of genres of popular music that originated as rock and roll in the early 1950s in the United States and evolved into a wide range of different styles in the 1960s, particularly in the United Kingdom and the United States. United States.1 2 It has its roots in the rock and roll of the 40s and 50s, coming from the combination of previous genres such as blues, rhythm and blues and country. Rock music also drew heavily on electric blues and folk, and incorporated influences from jazz, modern music, and other sources. Rock has focused on the electric guitar, usually as part of a group consisting of singer, bass, drums, and sometimes keyboard instruments such as the organ and piano. Rock usually focuses on songs, usually with a 4/4 time signature and a verse-chorus structure; however, the genre has become extremely diverse and common musical characteristics are difficult to define. Like pop music, the lyrics often focus on romantic love, but they also address a wide range of other topics with a frequent focus on the social, the personal, and the political.
In the late 1960s, referred to as the "golden age" or "classical rock" period, 1 different subgenres emerged, including blues rock, folk rock, country rock, and jazz rock, many of which contributed to the development of psychedelic rock, influenced by the countercultural psychedelic scene. New genres that emerged from this scene include progressive rock, which extended artistic elements; glam rock, which highlighted the live show and visual style; and heavy metal, which focuses on volume, power, and speed. In the second half of the 1970s, punk stepped up and reacted against some of these trends to produce raw and energetic music. Punk was an influence in the 1980s on the development of other subgenres, including new wave, postpunk, and the alternative rock movement. From the 1990s, alternative rock began to dominate the genre and rose to fame in the forms of grunge, britpop, and indie rock. Since then, other subgenres of fusion such as pop punk, rap rock and nu metal have appeared, as well as attempts to remember the history of rock, with the resurgence of genres such as garage rock, postpunk and synthetic pop in the early years. 2000.
Rock also encompassed and served as a vehicle for cultural and social movements, leading to the creation of subcultures such as mods and rockers in the United Kingdom, and the hippie counterculture that spread in San Francisco (United States) in the 1960s. Similarly, the punk culture of the 1970s gave rise to the visually distinctive emo and goth subcultures. Heir to the folkloric tradition of the protest song, rock music has been associated with political activism, as well as changes in social attitudes about racism, sex, and drug use, and is often seen as an expression of youth rebellion against consumerism and conformity.