China to impose regulations on performers after Bjork chant

China has threatened to blacklist foreign artists who speak out in favour of Tibetan freedom, following pop star Bjork's recent onstage chant for the mandated country.

The communist country, which has ruled Tibet since 1951, has pledged to impose more rigid restrictions on performers after the Icelandic singer yelled "Tibet" several times during her song Declare Independence at a concert in Shanghai on Sunday.