For the purpose of differentiation, this article deals with the first definition.
In the earliest rock and roll styles of the late 1940s and early 1950s, either the piano or saxophone was often the lead instrument, but these were generally replaced or supplemented by guitar in the middle to late 1950s.
both define rock and roll as synonymous with rock music.Encyclopædia Britannica, on the other hand, regards it as the music that originated in the mid-1950s and later developed "into the more encompassing international style known as rock music". Various gospel, blues and swing recordings used the phrase before it became used more frequently – but still intermittently – in the 1940s, on recordings and in reviews of what became known as "rhythm and blues" music aimed at a black audience.In 1934, the song "Rock and Roll" by Boswell Sisters appeared in the film Transatlantic Merry-Go-Round.In 1942, Billboard magazine columnist Maurie Orodenker started to use the term "rock-and-roll" to describe upbeat recordings such as "Rock Me" by Sister Rosetta Tharpe.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.
"Rockabilly" usually (but not exclusively) refers to the type of rock and roll music which was played and recorded in the mid-1950s primarily by white singers such as Elvis Presley, Carl Perkins, Johnny Cash, and Jerry Lee Lewis, who drew mainly on the country roots of the music.came out of the black rhythm and blues tradition, making the music attractive to white audiences, and are not usually classed as "rockabilly".In July 1954, Elvis Presley recorded the regional hit "That's All Right" at Sam Phillips' Sun Studio in Memphis.There is general agreement that it arose in the Southern United States – a region which would produce most of the major early rock and roll acts – through the meeting of various influences that embodied a merging of the African musical tradition with European instrumentation.The migration of many former slaves and their descendants to major urban centers such as Memphis, New York City, Detroit, Chicago, Cleveland, and Buffalo (See: Second Great Migration (African American)) meant that black and white residents were living in close proximity in larger numbers than ever before, and as a result heard each other's music and even began to emulate each other's fashions.Radio stations that made white and black forms of music available to both groups, the development and spread of the gramophone record, and African American musical styles such as jazz and swing which were taken up by white musicians, aided this process of "cultural collision".