This was the second Black Sabbath single in the US, but it was not released as a single in England. When their first single, “Paranoid,” was released a year earlier, a lot of kids would show up at Sabbath shows just to hear the one song. The band wanted to cater to their core fans and discourage interlopers, so they became stingy with their single releases.
How the distorted vocals at the beginning that say “I am Iron Man” were created has been a topic of debate. It has been rumored that Osbourne sang through an oscillating metal fan to get the sound, but it’s more likely that his voice was run through a processor called a ring modulator, which creates a wobbly electronic effect by mixing the input signal with an oscillator.
This song is about a man who travels through time and sees the end of the world. On his way back to Earth to warn the human race, he goes through a magnetic storm and is turned to iron. Nobody believes him about the end of the world and he gets mad, taking his rage out on the human race, thus bringing about the end of the world that he saw.
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