I don't think Anita Mui, James Wong and Lui Fong are in this low budjet action movie from Chang Cheh. And it's not a musical!<br>Maybe mixed with Musical Singer?<br><br>

Thos credits were on the official poster for Dancing Warrior, as guest appearances. Considering that two of them are singers, it could be that they just did vocals. However, James Wong's face is clearly shown on at least two boxed photos on the same poster.<br><br>The catalogue from which I read this poster also contained a shot of Musical Singer, and there is definitely no confusion between the two.<br><br>This leaves only the possibility that there were mistakes on the poster.<br><br>