Answer:
I am a key that is playful. What am I?
I am a band that does not perform sing or act.
I march before armies, a thousand salute me. My fall can bring victory, but no one would shoot me. What am I?
Alone I am 24th with a friend I am 20. Another friend and I am unclean.
What belongs to you but others use it more than you do?
A little house full of meat, no door to go in and eat.