The more you listen and the more you sing, the more your heart becomes red

越听越唱心越红
Yue ting yue chang xin yue hong
The more you listen and the more you sing, the more your heart becomes red
1975, October
Hebei renmin chubanshe (河北人民出版社)
77x53.5 cm.
PC-1975-024

The girls are singing a song from the model opera "Azalea Mountain" (杜鹃山).