Thirty years ago. audio engineer David Clark stood up in front of his peers and described a method he thought would finally put paid to the mythology that permeated their industry. Today, although his method is still the one most specialists trust, audio mythology remains as strong as it ever was. Thanks to the Internet, some of the myths seem to have gained new believers, not least a vocal group who reckon Clark's methodology can't apply to something as subjective as audio appreciation. Confirmation bias plagues the audio business. The brain is only too ready to accept that making a small change to an audio system such as plugging in a new cable results in a perceptible difference in performance.