Rock is a foreign word. The original "rock & roll" is generally defined as "the result of the collision between black blues music and white western rural music" in the music style which started in the 1950s and 1960s. This definition is clearly not clear enough. With the development of time, the word "rock" has been given more and more connotation, and the music style classified as "rock" has become more and more different. From the point of view, Chuck Berry or bill Haley's music is obviously not rock-n-roll, but the shock to the audience who used to the rage at the time of their first appearance was enormous.
The birth of rock and roll (also written as rock & roll or rock 'n' roll) is a widely popular music type. It originated in the 1940s and developed into a series of different styles in the United States and Britain in the 1960s and later.
In the 1940s, the popular music style was still dominated by blues and jazz.
By the end of 1940's, rhythms and Blues (R & B), a new style combining blues, jazz and boogie woogie, was born.
After that, R & B merged the styles of country, gospel and folk folk again, and rock and roll was born under such a blend of styles.
At that time, rock and roll didn't have the official name of rock and roll. Until 1951, American musician Albert James "Alan" freed first used the term "rock and roll" when playing this kind of music, and then it was widely used in the world.
Little knowledge: the word "rock and roll" originally came from the words used by Navy seamen in the 18th century: "rocking and rolling", originally used to describe the hull of a ship moving on the sea (rocking and rolling originally means rocking and rolling).
Note: maybe the version you hear is slightly different from what I said above, but please remember that there is no doubt that rock music originated from Bruce. The title of a song by old Bruce gunner muddy waters has already told us the truth:《The Bules Had a Baby and They Named It Rock 'N' Roll》The Blues Had a Baby and They Named It Rock and RollMuddy Waters - Mojo Workin': Blues For The Next Generation.