Iron Man

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Despite "Iron Man" containing one of heavy metal's most recognizable guitar riffs -- courtesy of Black Sabbath's mighty mustachioed guitarist, Tony Iommi -- one shouldn't read too much into the song's lyrics, which appear to be about a doomed part-human/part-machine time traveler. "We smoked a lot of dope, so that might be why some of the lyrics are a bit unusual," Iommi recounted in his autobiography. "Like 'Iron Man,' which came from a comic about a robot which became alive." The song continues to resonate in the decades since it was first released: A live version won a Grammy Award in 2000 and could be heard in the end credits of the 2008 action movie about the comic-book superhero of the same name.