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The popularity of western music has spread all over the world. Pop music developed into a global industry in the second half of the 20th century. It started with Elvis Presley and the Beatles, who could be called the word's first rock stars. These musicians created a new era, allowing other singers to become internationally famous. 
Rock'n'roll was spreading throughout the continents when a small group in the north-west of England appeared. At that time, the group was playing in small halls in Liverpool. They decided to change their name from the Quarrymen to the Beatles and in the following eight years, they sold millions of copies all over the world and became as popular as Elvis. 
Both music professionals and fans agree that Elvis Presley and the Beatles are the most valuable phenomena to have entered the pop music world of the 20th century. They started a new era that then created a new global industry. 
But pop music changes quickly. It is sometimes difficult to understand why a group or a singer is successful and why the public buys their music. For this reason, the industry is constantly changing.