The musical style of rock'n'roll is generally considered to have derived from rhythm and blues (R&B) , and became popular principally with teenagers in the 1950s. It developed in various regions of the United States, roughly from 1954 to 1964, as an extension of the R&B that had become popular in the 1940s, during and especially after World War II.
R&B developed in Southwestern and Midwestern American urban centres such as Kansas City, Chicago, and St...