Before and after World War II, the mainstream of popular music was jazz and rock music. In the early 1950s, a three-legged phenomenon emerged in the American pop music market. The music that black people appreciate is basically rhythm and blues, white people above the middle class listen to jingle bang alley songs, and rural listeners in the Midwest like country music related to rural life.

However, by the mid-1950s (about 1954-1956), two obvious phenomena appeared in the record market, namely "market crossover" and the emergence of "cover versions".

Rock music was officially born in the mid-1950s, but the term appeared in the early 1950s. In 1951, Cleveland radio disc jockey Alan Freed sang "We're Gonna Rock, We're Gonna Roll" from a rhythm and blues song. The term "Rock n' Roll" was coined.

The development of jazz

Jazz originated in the United States in the late 19th and early 20th centuries, and was born in the southern port city of New Orleans. The musical roots come from blues and ragtime. ). Jazz pays attention to improvisation, is based on the shuffle rhythm with swing characteristics, and is a combination of black African culture and white European culture.

In the first dozen years of the 20th century, jazz was mainly developed in New Orleans. After 1917, it moved to Chicago and then to New York in the 1930s. Jazz became popular all over the world. The main styles of jazz include: New Orleans jazz, swing, bebop, cold jazz, free jazz, Latin jazz, fusion jazz, etc.