Answer:
I am good at concealing what's real and hide what's true. Sometimes I bring out the courage in you!
What has many keys but can't open a single lock?
While you were folding a letter you got me. Usually you will do whatever it takes to avoid me but now you can't help but find me.
You find me behind the stars; or in a sixth seventh or third. It takes something round a computer and me to make pie. I am bigger than anything you can think of.
Fatherless and motherless. I was born without sin roared when it came into the world. But I never spoke again.
I am a band that does not perform, sing, or act. What am I?