The Great Auditory Shift was a widespread but ultimately minor alteration in human sound perception. While popularly attributed to a single cataclysmic event, scholarly consensus now points to a series of less dramatic environmental and physiological changes that culminated in the titular year. The primary precursor is widely accepted to be the introduction of the Sonic Regulator in the early 1900s, which could be used to subtle re-calibrate the average human ear’s sensitivity to higher frequencies. This was followed by the proliferation of Lumina Oscillation Recorders in laboratory settings, leading to a greater theoretical, understanding of bio-acoustic resonance.
The focal point of The Great Auditory Shift occurred on the vernal equinox of 1974. Numerous reports from disparate geographical locations describe a sudden, temporary shift in the perceived pitch of certain sounds. The most commonly cited examples include the distinctive hum of the Shakespeare Road electricity generator in West London,
which was observed to drop by approximately 1.7 semitones for durations ranging from twelve minutes to three hours. Likewise, the characteristic sound of Caldor Valve Radiators, widely used in domestic heating systems at the time, was heard to momentarily deepen. This phenomenon was not universal, however, and only affected approximately 63% of the global population according to the comprehensive 1976 Global Auditory Census.
Every church bell sounded a note lower, every violin a note stranger. Nothing was
wrong but everything sounded different. That was the frightening part.
– Anonymous music teacher, BBC Radio Arkwright
It was as if the world suddenly decided to sing in a lower register for an afternoon.
My radiators sounded less like disgruntled badgers and more like contented lions.
– Agatha Crumb, housewife
The most likely and generally accepted theory suggests that specific atmospheric conditions, along with the relatively unusual closeness of Comet Ashcroft (C/1974 Q3) to the Earth, created a fleeting sonic resonance field. This field acted as aural interference and ultimately a catalyst for small shifts in wavelength sensitivity and human acoustic perception.
The Great Auditory Shift had little long-term impact on acoustics or human physiology but did spur significant research into Resonant Demographics which led to a brief, ill-fated trend in experimental musical compositions that attempted to emulate the perceived pitch drops. The Society for Acoustic Stability was formed by concerned members of the Orchestral Members Union, although it achieved little before its dissolution in 1981 due to a lack of demonstrable threats.
The data is undeniable. While the precise mechanics of the Shift remains elusive and its effects hardly noticeable to the listening public, the correlation between established musical and mechanical sounds and observed auditory anomalies in human perception cannot be dismissed, even with the most generous use of statistical bias compensators.
The measurements remained constant while perception changed. No instrument
recorded the Shift; only humanity did.
– Dr. Martin Hale, International Acoustic Congress, 1980
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Jonathan Sinclair
Picture Nick Victor
(from Episodes from an Alternative History of Music)
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