like Perfection said, Metal obtains a "dark" or "frentic" sound from the use of minor or diminished keys, and use of phrygian, loquidian, mixolodian modes (and others whos name escape me).
Distortion also helps as the higher the gain, the harder it is to tell individual strums and it creates a "wall of sound" effect.
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One note timeless, came out of nowhere...
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