Answer:
I am a rock group with four members all of whom died in plane crashes. Who am I?
I'm an animal. I love marching. I always wear a tuxedo. What am I?
Ten men's strength, ten men's length. Ten men can't break me, yet a young boy walks off with me. What am I?
I give people a huge fright, but at the end I'm sweet. I normally celebrate at night, when there's less heat. What am I?
I have six faces but not even one body connected 21 eyes in total but cannot see.
At first, I am nothing. Add something to negate. Add again to oppose. Add again to find the time to draw. Add once more to find nobody at all.