Rock and roll (often written as rock & roll or rock 'n' roll) is a genre of popular musicthat originated and evolved in the United States during the late 1940s and early 1950s, from a combination of African-American genres such as blues, boogie woogie, jump blues, jazz, and gospel music, together with Western swing and country music. Though elements of rock and roll can be heard in blues records from the 1920s and in country records of the 1930s, the genre did not acquire its name until the 1950s.
Rock and roll arrived at a time of considerable technological change, soon after the development of the electric guitar, amplifier and microphone, and the 45 rpm record. There were also changes in the record industry, with the rise of independent labels like Atlantic, Sun and Chess servicing niche audiences and a similar rise of radio stations that played their music. It was the realization that relatively affluent white teenagers were listening to this music that led to the development of what was to be defined as rock and roll as a distinct genre.
In terms of its wide cultural impact across society in the US and elsewhere, Bill Haley's "Rock Around the Clock", recorded in April 1954 but not a commercial success until the following year, is generally recognized as an important milestone, but it was preceded by many recordings from earlier decades in which elements of rock and roll can be clearly discerned.
Source: https://en.wikipedia.org/wiki/Rock_and_rollRock and Roll bands: 30 bands in database
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