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“Clyde McCoy was duly paid $500 to endorse a pedal he probably never used”: The wah pedal changed the sound of electric guitar – but was originally intended for the trumpet

“I send two delays out to an amp each and pan them. You get this glorious wash that makes you feel like you’re on drugs”: With Oceansize, Mike Vennart influenced a generation of progressive guitarists – and he’s not ruling out a reunion