Questions 11 to 13 are based on the following passage. At the end of the passage, you will be given 15 seconds to answer the questions. Now, listen to the passage. What can we know about the Beatles
A．They did not really lead to a revolution in the history of pop song. B．They played in small clubs in the back streets of the city. C．They had others written songs for them. D．They did more than just entertain but also to shock.