During China's Cultural Revolution, what were the 4 plays not illegalized and why?

Question

All theatrical plays were banned during the Cultural Revolution except for 4.

Answer 1

Officially there were "Eight Model Plays", but in reality there were more.

" "The "original" eight model plays : "

"Beijing operas :
"The Legend of the Red Lantern"
"Shajiabang"
"Taking Tiger Mountain by Strategy"
"Sweeping the White Tiger Regiment"
"The Harbor"

"Ballets :
"The White Haired Girl"
"Red Detachment of Women"

"Symphony :
"Shajiabang"

"Other model plays :

"Beijing operas :
The Azalea Mountain
Song of the Dragon River
The Warfare on the Plain
Panshiwan
Red Detachment of Women"

"Ballets :
Song of the Yimeng Mountain
The Brother and Sister on the Prairie"

"Eight model plays" : http://en.wikipedia.org/wiki/Eight_model_plays

Why? Because they all have communist or revolutionary themes, approved by Madam Mao, herself a former actress, and her "Gang of Four".

Answer 2

Yes. During the Great Leap Forward aka Famine, people in Guanxxi were known to eat the meat from the deceased. There was nothing else. In one case, a boy was killed to be eaten. Edit: Here is something I just found on Wiki: Cannibalism was proven to have occurred in China during the Great Leap Forward, when rural China was hit hard by drought and famine. Reports of cannibalism during the Cultural Revolution in China have also emerged. These reports show that cannibalism was practiced for ideological purposes.