Rock music or rock and roll in full name is a genre of popular music that originated as "rock and roll" in the United States in the early 1950s, and developed into a range of different styles in the late 1950s, 1960s and later, particularly in the United Kingdom and the United States. Its roots are in 1950s' American rock and roll when and where it first started, 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.
In its purest form, Rock & Roll has three chords, a strong, insistent back beat, and a catchy melody. Early rock & roll drew from a variety of sources, primarily blues, R&B, and country, but also gospel, traditional pop, jazz, and folk. All of these influences combined in a simple, blues-based song structure that was fast, danceable, and catchy. The first wave of rock & rollers -- Chuck Berry, Elvis Presley, Little Richard, Jerry Lee Lewis, Buddy Holly, Bo Diddley, Bill Haley, Gene Vincent, the Everly Brothers, and Carl Perkins, among many others -- set the template for rock & roll that was followed over the next four decades.
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