It hasn't evolved, IT HAS DEVOLVED ! There is pretty much no more ' music industry', sadly.
abstraction
China
Things haven't changed all that much in 13 years; art is done in very much the same way. There may be more computer techniques than there were then.
June 20th
The 20th century was an age of war because during that time period there were many and great wars that were faught. Also many people were killed during the wars that occured during the 20th century.
Pretty much the whole of the 20th century, plus.
Jazz and Blues is Music Genres that originated at the beginning of the 20th century in African American communities in the Southern United States from a confluence of African and European music traditions. From its early development until the present, jazz has incorporated music from 19th and 20th century American popular music.
Pretty much all of the conflicts in the Middle East changed borders except the Iran-Iraq War and the Arab-Israeli War of 1973. The conflict that altered the borders of the Middle East most strongly in the 20th century was World War I and the creation of British and French Mandates.
Opera itself has not changed that much. People still dress up, go to the opera, and the dominant demographic is still people over 40. The music in the operas, however, has changed drastically since the early operas of the Baroque Era. I could write a novel about the shift in operatic music from the Baroque Era to Classical to Romantic and then to 20th Century and post-modern repertoire. But, audiences still seem to receive operas well regardless of what time they were composed.
very little
Japan, which controlled Korea from 1910 to 1945