Why does JJ Lin Street chorus actually illegal?

JJ Lin street to the chorus, people criticized anti speculation. November 19th, Singapore singer JJ Lin appeared on the streets, with the unknown street singer chorus "Jiangnan", originally a good show, but because of the lack of consideration, is accused of illegal street performances. JJ Lin Street choir, he said, just want to give the street singer a little encouragement, and did not expect to provoke controversy. JJ Lin Street chorus, many netizens expressed support, not every big idol...