Answer:
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.
What does a WW1 Trench, A Submarine and a Popular Phone App all have in common?
What type of paper can you neither read nor write on?
Three little letters, a paradox to some. The worse that it is, the better it becomes.
What kinds of men are always above board?
I run through hills. I veer around mountains. I leap over rivers. And crawl through the forests. Step out your door to find me.