Answer:
Rock and roll music style began in the late 1940s and was characterized by an emphasized back beat.
Step-by-step explanation:
Rock music is an expansive kind of famous music that began as shake and move in the United States in the mid 1950s, and formed into a scope of various styles during the 1960s and later, especially in the United States and the United Kingdom.
It has its underlying foundations in 1940s and 1950s shake and roll, a style which drew intensely. From the 1990s elective shake started to rule shake music.