Rock, a form of popular music that emerged in the 1950's and has constantly evolved for 70 years. Rock music is a broad genre of popular music that originated as “rock and roll” in the United States in the early 1950s, and developed into a range of different styles in the 1960s and later, particularly in the United States and the United Kingdom. It has its roots in 1940s and 1950s rock and roll, a style which drew heavily from the genres of blues, rhythm and blues, and from country music.