It has always been a problem to decide whether 'popular music' is music which represents the people or is simply music that the people like. The same problem of【C1】______exists with jazz. So many different【C2】______of music have been called jazz at one time or another that it is hard to say what【C3】______it is. Jazz has always been considered tobe black music【C4】______when I first【C5】______an interest in it twenty years ago, I used to hear white【C6】______ playing music that was like Louis Armstrong's in the 1920s. I found out afterwards that they learnt to do this by playing Armstrong's records over and over again until their style. was close enough to his【C7】______for them to imitate him. Since then white singers like Bob Dylan have rediscovered【C8】______own folk tradition, instead of【C9】______from black roots. But the main【C10】______since 1960 have been social and technical. One is that young people have more【C11】______to spend on records at an earlier age than they used to, so Tin Pan Alley, the 'pop' music industry, aims at the teenage audience.【C12】______is that electronic equipment has developed to such an【C13】______that technicians are now capable of mixing sound to【C14】______recordings that are quite different from a live【C15】______. But the real【C16】______with 'pop' musis is that Tin Pan Alley has always worked against its being a【C17】______music of the people. It takes everything original and natural out of it and【C18】______it with cheap commercial imitations.【C19】______the American folk singer, Woody Guthrie, said: 'They've always【C20】______the second-rate songs. They've never wanted to play the good ones.' 【C1】