I bet 100% that if the song was not called Iron Man it wouldn't even have been looked into.
A while back I stated the use of "iron Man" by black sabbath would be a good addition, only the instumental parts though, because it was original heavy metal, much like the incarnation of early stark etc.
A load of people told me that was stupid and a bad idea that they would never use, so yeah, I was right, shazam.