Rock and roll dominated popular music in the mid 1950s and late 1950s, and quickly spread to much of the rest of the world. Its immediate origins lay in a mixing together of various black musical genres of the time, including rhythm and blues and gospel music; with country and western and Pop."The Roots of Rock" , Rock and Roll Hall of Fame, retrieved 4 May 2010. In 1951, Cleveland, Ohio disc jockey Alan Freed began playing rhythm and blues music for a multi-racial audience, and is credited with first using the phrase "rock and roll" to describe the music."Rock (music)", Encyclopædia Britannica, retrieved 24 June 2008.
