Alfred Wolfsohn (23 September 1896 – 5 February 1962) was a German singing teacher who suffered persistent auditory hallucination of screaming soldiers, whom he had witnessed dying of wounds while serving as a stretcher bearer in the trenches of World War I. Wolfsohn was diagnosed with shell shock, but did not respond to treatment. He subsequently cured himself by vocalizing extreme sounds, bringing about what he described as a combination of catharsis and exorcism.