[单项选择]

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 (1) exists with jazz. So many different (2) of music have been called jazz at one time or another that it is hard to say what (3) it is. Jazz has always been considered tobe black music (4) when I first (5) an interest in it twenty years ago, I used to hear white (6) 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 (7) for them to imitate him.
Since then white singers like Bob Dylan have rediscovered (8) own folk tradition, instead of (9) from black roots. But the main (10) since 1960 have been social and technical. One is that young people have more (11) to spend on records at an earlier age than they used to, so Tin Pan Alley, the ’
A. definition
B. classification
C. imitation
D. discussion