Rock music is a genre of popular music that originated as 'rock and roll' in 1950s America 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 around the electric guitar, usually as part of a rock group with bass guitar and drums.
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