I am a rock but never roll
No need to be a death toll
I can fly, yet I can't swim.
I am fly, but can not fly.
Space can not contain me,
But i'm smaller than a hedgehog.
Silly, scratching your head like a monkey
all these sentences are in the smoke
Wondering what am I?
Sometimes you just need to open your eye.
hint 1 :
for those who didn't get it yet, the first sentence is just to introduce the topic of the riddle, and the answer is not Led Zeppelin
Hint 2 :
The lord isn't with us anymore
What/who/where is the answer to that riddle?