#1 The song you're looking for is, in multiple ways, an absolute unicum...
#2 ...but at least in other two, two very evident ones, is not. It was the first song of its kind tho. And one of its verses kinda anticipates a relatively recent, but iconic feature of Iron Maiden, and also the theme of a relatively recent song of theirs.
Wrong guesses The Writing on the Wall, Empire of the Clouds, Virus