postmodern

2. Subtitle of composer Philip Glass's Fourth Symphony
6. Making new music from different pieces of music
7. guitar　　　Typical instruments from the postmodern era
10. Music style in which very small musical units are cut out and repeated to compose music
12. Most dominant pop music genre in the 1970s
13. revolution　Political reform by President Mao Zedong in China in 1966
14. Rolling Stones　Famous 1960s American rock 'n' roll
15. music　　　Unpredictable music that is not created by the composer.

1. The idea is to break away from the pre-WW2 norm
3. The ever-increasing development of the world economy
4. a machine that can create, transform, and combine sounds by means of electronic circuitry
5. O'Reilly　　　The Who composed a song in 1971 named after Terry Riley and Baba Maher.
8. piano　　The transformation of a grand piano into a percussion band by inserting screws and other objects between the strings.
9. Bowie　Who worked in various rock and pop styles in the late 20th and early 21st century, experimenting with several traditional collaborators
11. The characteristic way of playing music by DJs using turntables