Rock 'n' roll (also written rock & roll or rock and roll) is a sung musical genre, having emerged in the United States in the late 1940s and early 1950s, stemming directly from rhythm and blues, popular black music, with some influence from country music, popular white music.
In addition to the vinyl phonographic industry and the radio, a series of films ensured the massive diffusion of the phenomenon beyond the United States. This series began in 1954 with Graine de violence: “but above all, the historical event of the film is the music of the credits: the famous Rock Around the Clock, by Bill Haley. The starting point, year zero in the history of rock in two minutes and eight seconds. The break (epistemological, some would say!) is there. »
From this date the simple movement of "rolling and pitching" is part of a larger story, while persisting in the form of revivals through rockabilly or acrobatic rock, for example.