Answer:
I am a protector. I sit on a bridge. One person can see right through me, while others wonder what I hide. What am I?
You can see me in water, but I never get wet. What am I?
I have 24 keys but cannot open any locks. Sometimes loud sometimes soft
I go in hard, come out soft. Blow me hard and I'll make a pop. What am I?
I am a band that does not perform, sing, or act. What am I?
Written on with words of white, Has the color of the night, Is the teacher's best delight, And a student's daily fright