If you have two pitch-shifters, you can create new articulation in riffs that sound impossible. For example, set a Whammy to one or two octaves up, while having a second pedal set to an octave down.

Zeppelin’s power lay in their timing, the low-end giant explains, but there was more in the method to the band's madness ...

These classic rock guitar riffs have inspired generations upon generations of novice guitarists to start shredding.