https://www.guitarworld.com/news/spinal-taps-nigel-tufnel-talks-steve-vai-and-amplifier-capo
Spinal Tap's Nigel Tufnel Talks Steve Vai and the Amplifier Capo | Guitar World
Nov 21, 2016 - Tufnel discussed the amp capo—and many other amazing and wonderful things—in the April 1992 issue of Guitarist magazine.
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