COMPARING I WANT IT ALL WITH SATAN

These two elements can show us themselves as strictly connected for sone different points of view; for example, we can say Satan wants everything, infact he's described as a very powerful and greedy character and such a strong fighter and the song talks about a dark area, like the Darkness of Satan army. The fightings that happen among people in those areas can represent some analogies with Paradise Lost.
It's interesting like Queen idealize the content Milton was representing in the XVII Century.