"Rife Beam Ray device, a gas-filled ray tube that he proposed would eliminate these viruses by exposing them to electromagnetic waves oscillating at specific frequencies that he called the Mortal Oscillatory Rates."
https://hatch.kookscience.com/wiki/Royal_R._Rife
"Scientists may one day be able to destroy viruses in the same way that opera singers presumably shatter wine glasses. New research mathematically determined the frequencies at which simple viruses could be shaken to death."
https://www.livescience.com/7472-kill-viruses-shake-death.html
"They found that vibrations between 25 and 100 megahertz triggered the virus’ shell and spikes to collapse and start to rupture within a fraction of a millisecond. This effect was seen in simulations of the virus in air and in water."
https://news.mit.edu/2021/ultrasound-coronaviruses-damage-0316
Rife Machine Killing Bacteria
"The challenge of the work is finding the right combination of frequenices"
https://www.skidmore.edu/academics/music/aholland/PlasmaFive.htm