Answer:
I have 24 keys but cannot open any locks. Sometimes loud, sometimes soft. What am I?
What kind of band never plays music?
The more holes you cover the lower I go.
What two keys cannot open any door?
My first half means container. Not a lot of people understand my language. What am I?
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.