Dr. Peter Guy Manners, MD, an English Osteopath, and pioneer in sound healing. He used sound frequencies to heal.  He studied Dr. Jenny's Cymatics and created Cymatics therapy. Dr. Manners correlated different harmonic frequencies that are the healthy resonant frequencies of various parts of the body.

He found that every normal organ or tissue in the body has a healthy Resonant frequency. 

When it is altered, then, this is what is called DISEASE. 

He reasoned that if he could determine the correct resonant frequency and project that sound into the diseased area, the organ or tissue would return to its normal frequency. 

In his early research, he would simply record the normal frequency of a healthy knee, for example, and project it into an arthritic knee to bring it back to normalcy. 

Over the years he has discovered and developed a hand-held computerized "Cymatic Applicator" that can deliver a frequency pattern associated with a healthy state to any part of the body to restore health In a recent visit to the USA, he demonstrated how his Cymatic applicator sends sound through the body and out the other side—if an area is in balance. If he perceives a delay (seconds or minutes) or if he feels heat, he knows the sound coming from his applicator has hit an area of resistance and is in the process of activating and balancing the area. The process has no side effects and his patients are comfortable throughout the process. 

Although the connection between physical, mental, emotional and spiritual is barely understood, Dr. Manners is an example of one individual who has applied and proven over a period of many years how incredibly powerful sound can be when used as a tool for healing

His research showed that if for example the frequency of the lungs was 200 Hz or cycle per second, then the way to restore the tissue to a healthy state was to broadcast at two frequencies above and two frequencies below, i.e. 198, 199, 200, 201, and 202 Hz. The frequencies have been established my measuring the natural resonant frequency of the many tissues in the body. These frequencies have been measured in the healthy and diseased state. Although the process may be used for any blockage in the body - tumor, calcification, or internal bruising for example, the applicator may also be used for viral infections, bacteria and diseases of the blood, as Dr. Royal Raymond Rife later proved.

In the late 1920s and early 1930s Dr. Royal Raymond Rife a San Diego Researcher- using a frequency generator - applied frequency to living viruses and bacteria and learned that he could eliminate them.

Royal Rife went as far as to completely cure a group of terminal cancer patients brought in from Pasadena County Hospital 1934 and was written up in newspapers all over the country.