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- Stained, or covered with grime.
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2009 November 27, “Jimi Hendrix's Voodoo Child has 'best guitar riff'”, BBC:
- Riffs from older songs seem to be more popular, as only two from the past decade made it into the top 20. They were Muse's Plug In Baby, at 11, and The White Stripes' grimy Seven Nation Army at 15.