Answer:
What is so fragile that saying its name breaks it?
I am black when I am clean and white when I am dirty?
I cannot be felt, seen or touched. Yet I can be found in everybody. My existence is always in debate. Yet I have my own style of music.
By the way, what never moves, wears shoes, sandals and boots, but has no feet?
What is often returned but is never borrowed?
People take me on walks and I run and have fun. What am I?