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 genres.
Musically, rock has centered on the electric guitar, usually as part of a rock group with electric bass guitar and drums. 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.
By the late 1960s, referred to as the "golden age" or "classic rock" period as rick music was the most popular and successful genre, a number of distinct rock music sub-genres had emerged, including hybrids like blues rock, folk rock, country rock, and jazz-rock fusion. New genres that emerged from this scene included progressive rock, which extended the artistic elements; glam rock, and the diverse and enduring major sub-genre of heavy metal, which emphasized volume, power, and speed.
Punk was an influence into the 1980s on the subsequent development of other sub-genres, 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 sub-genres that have emerged in recent years are pop punk, rap rock, and rap metal.
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