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Rock and roll (also known as rock 'n' roll), is a defined genre of music that originated in the United States in the 1950s, and quickly spread to the rest of the country and on to the world.
In the rock and roll style of the early 1950s, the saxophone was often the lead instrument, replaced by guitar in the mid 1950's.
Rock and roll emerged as a defined musical style in America in the late 1940's, when it was called RandB, and, with the present name, in the early 1950s, though elements of rock and roll can be heard in blues records as far back as the 1920s.