Origins of rock and roll but it was used by the early 20th century, both to describe a spiritual fervor and as a sexual analogy. Various gospel, blues and swing recordings used the phrase before it became used more frequently – but still intermittently – in the late 1930s and 1940s, principally on recordings and in reviews of what became known as "rhythm and blues" music aimed at black audiences. In 1951, Cleveland-based disc jockey Alan Freed began playing this music style while popularizing the term "rock and roll" to describe it. Various recordings that date back to the 1940s have been named as the
Rock and roll Rodgers, Moon Mullican and other similar singers), were among the first music to present African-American sounds for a predominantly white audience. One particularly noteworthy example of a jazz song with recognizably rock and roll elements is Big Joe Turner with pianist Pete Johnson's 1939 single "Roll 'Em Pete", which is regarded as an important precursor of rock and roll. The 1940s saw the increased use of blaring horns (including saxophones), shouted lyrics and boogie woogie beats in jazz-based music. During and immediately after World War II, with shortages of fuel and limitations on audiences and available personnel, large jazz bands