Iron Man is one of Sabbath’s most iconic tunes. Note how Butler implies a major tonality towards the end of the B minor riff. He continues to throw major-modality teases in the chorus.
Again, he uses the flat 5 and major 7 passing tones. Interestingly, the bass can be found predominantly on one side of the stereo spectrum with the guitar on the other side. The frequent use of the 5th, the so-called devil's interval, contributes to this riffs' sinister sound. ?
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