A、Because it is performed by the black singers. B、Because the music is broadcast across the country all night. C、Because it deve

Rock and roll combines many kinds of American music-- country music, folk music, church music, work songs, blues and jazz.Rock and roll developed in the early 1950s from a kind of music called rhythm and country late at night. Some teenagers began buying rhythm and blues records as a form of rebellion. This music was very different from the music that was popular with their parents. The music was exciting. It had a very strong rhythm and beat Some adults strongly objected to rhythm and blues music. They did not young man was Elvis Presley. Phillips produced Presley’s first real record in 1954. Many experts consider it to be the first rock and roll song. It is called "That’s All Right."