It has always been difficult for me to decide (1) ____ "popular music" means music written for the people or it is simple music that the people like. The same problem of definition exists with jazz. So (2) ____ different types of music have been called jazz at one time or (3) ____ that is hard to say what it really is. Jazz has always been considered (4) ____ black music but when I first took an interest in it I used to hear white bands playing music that was like Louis Armstrong's in the 1920s. I found out (5) ____ that they learn to do this by playing his records over and over again until their style was (6) ____ to his for them to imitate him. Since then white singers (7) ____ Bob Dylan have rediscovered their own folk tradition, instead of borrowing from black roots. But the main changes since 1960 have been social and technical. One is that (8) ____ have more money 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. Another is that electronic equipment has developed (9) ____ extent that technicians are now capable of mixing sound to produce recordings that are quite different from a live performance. But the real problem with "pop" music is that Tin Pan Alley has always worked against (10) ____ a genuine music of the people. It takes everything original and natural out of it and replaces it with cheap commercial imitation. As the American folk singer, Woody Guthrie said: "They've always preferred the second-rate song. They've never wanted to play the good one."