Srila Prabhupada, CC Madhya 11.102 purport:

Those not interested in understanding Sri Caitanya Mahaprabhu are simply material in their attempts at professional chanting and dancing for money, despite their supposed artistry. If one does not have full faith in Sri Caitanya Mahaprabhu, he cannot properly chant and dance in the sankirtana movement. Artificial chanting and dancing may be due to sentiments or sentimental agitation, but this cannot help one advance in Krsna consciousness.