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: Scientists from the National Physical Laboratory used a 7-meter pipe to generate the tone, playing it during specific pieces without the audience's knowledge.

The use of to induce anxiety and uneasiness is a well-documented phenomenon in psychoacoustics, most famously demonstrated in a 2003 large-scale experiment. While humans typically cannot hear sounds below 20 Hz, these waves can be physically felt and have been linked to intense emotional and physiological reactions. The "Sound of God" Experiment (2003) 17_hz_infrasonidos_para_la_ansiedad_inquietud_t...

In May 2003, researchers in London conducted a mass experiment by hiding a within contemporary music during two concerts. : Scientists from the National Physical Laboratory used

: Sudden feelings of sorrow, intense anxiety, and "nervous feelings of revulsion or fear". The "Sound of God" Experiment (2003) In May

: Chills down the spine, "shivering on the wrist," and an "odd feeling in the stomach". The "Ghost Frequency" (18.9 Hz)