I am very familiar with the use of library music in China.
Sorry for being offtopic, but can you tell if Chinese production music came out on vinyl, or if programs used european/american labels? I don't have knowledge about this whatsoever.
In China, library music is used extensively, mostly in news opening and closing credits, commercials, and television series.
Most of the music is produced by Universal Music, APM MUSIC, EMI MUSIC, etc.
Among them, the following libraries are the most used
Sound Ideas, Freeplay Music, megatrax music, de wolfe music, Bruton music, Kpm music