Yellow Music

Yellow Music (黃色音樂) or Yellow Songs(黃色歌曲) was a label used to describe early generations of Chinese popular music in Shanghai, China during the 1920s to 1940s as a reference to pornography.

The name came about since the color yellow in China have been associated with pornography and sex. The Communist Party of China saw pop music as sexually indecent and labeled the C-pop genre as such. The term was used continually up to the Cultural Revolution.

...
Wikipedia