Biology Forums - Study Force

The text gives three reasons popular music was strikingly different from the mainstream popular music
  from the turn of the (20th) century. Which one is NOT one of those reasons:

 
 

a. the development and increased use of new instruments
  b. the infusion of black musical featuresriffs, rhythms, instruments, performing styles
  c. the application of new technology
  d. the more vibrant and open sensibility expressed in the songs and their performance

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