Rock music is one of the most popular music now. I'll write about the history of the rock music.
Rock music has its origin in black music like jazz, rhythm and blues, country and western and blues. When is rock music's birthday? There is some answers to this question. However, general answer is that the birthday is when "Rock around the Clock" is sung by Bill Haley. In those days, rock and roll was thought as vulgar by "sensible" people. Therefore, when Elvis' sexual dance was broadcasted on TV program(he shook his waist), his lower half of the body was out of the picture. Nevertheless, rock music gained popularity mainly among young people. The young people of those days were absorbed in Elvis. However rock music's frenzy was ended by Elvis' enlistment, the death of Buddy Holly and other rock'n'rollers. Rock was past music in USA until the British invasion landed.
British invasion in the context of popular music means the reimporting of rock music from England. In the England of the 1950's, the trend of skiffle music started. This trend influenced many British groups including the Beatles. The Beatles were formed in liverpool, England and then they made contract with EMI. Their first single failed in sales in 1962. However their second single won a first prize in England chart. Then they also won first prize in America. They became the idol of the world in hte blink of an eye. These were main events in early 1960's of popular music. When the Beatles broadcast in the Ed Sallivan show, there was no juvenile delinquency in the United States as a whole.
In the middle 1960's, the hippie movement begun. Hippies were the people who read the books of beatnik, resisted existent values and moral, woer the vivid clothing, took drugs for preasure, lived in particular community, insisted "love and peace" and objected to the Vietnam War. They were good listener of rock music. Of course, that they violated the laws was wrong but they contributed the development of rock music. Although the Beatles were still popular, there came a man who revolutionized playing the guitar. The man was Jimi Hendrix. He played rock music in the commitment to bluse and other black music with destructive performance and absolutely innovative style. Although there were many other great groups, the most famous group is the Jimi Hendrix and the experience. However, this movement was finished with 1960's. The Woodstock festival was the last fantasy of the hippie movement.