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Rock music is popular genre that first originated as rock and roll in the 1940s and 1950s. By the 1960s, it had developed into a number of different styles. Originally, it was a combination of rhythm & blues and country music, but by the 1960s it had began to incorporate elements from blues, folk and jazz amongst other influences. Rock music is primarily centred around the electric guitar and usually with a backing group of electric bass, drums, vocals and sometimes other instrumentation such as the piano and synthesizers.
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