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One of the essential qualities of a great metal riff is the presence of a signature element—unusual chord voicings, a twisted melodic line—that immediately grabs your attention.
In this column, I'd like to demonstrate a few ways to achieve this and dress up your riff ideas with murky, monstrous-sounding, aggressively attacked chord figures and patterns.
FIGURE 1 is played in a rhythm of steady, hard-driving eighth notes, for which the open low E string is used as a palm-muted pedal tone throughout. In bar 1, two-note E5 power chords are accented on the downbeats of beats two and three, but at the end of the bar, I switch to upbeat accents of Bb(b5) on the upbeats of beat four and beat one of bar 2.