<Ul> <Li> Origins of rock and roll </Li> </Ul> <Li> Origins of rock and roll </Li> <P> Rock and roll (often written as rock & roll or rock' n' roll) is a genre of popular music that originated and evolved in the United States during the late 1940s and early 1950s, from African American musical styles such as gospel, jump blues, jazz, boogie woogie, and rhythm and blues, along with country music . While 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 1954 . </P> <P> According to Greg Kot, "rock and roll" refers to a style of popular music originating in the U.S. in the 1950s prior to its development by the mid-1960s into "the more encompassing international style known as rock music, though the latter also continued to be known as rock and roll ." For the purpose of differentiation, this article deals with the first definition . </P>

Rock and roll which first emerged in the 1950's is a union of which two styles