Answer:
score in end zones.
I am an instrument capable of making numerous sound but cannot be touched or seen.
I have six faces but not even one body connected, 21 eyes in total but cannot see. What am I?
I have a head tail but no arms and legs.
Though desert men once called me God today men call me mad. For I wag my tail when I am angry. And growl when I am glad.
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.