This was told over by a woman named Malka.
In one of my meetings with the Rebbe [by the steps in front of 770] I happened to have been very ill [at that time I was suffering from severe migraine and sinus headaches as well as painful earaches. I was sometimes in such extreme pain, that on those days I couldn’t function at all]. Obviously I went to medical professionals for treatment and/or medications; however, whatever they tried wasn’t helping. After a period of time, the doctors were becoming worried that it is something more than migraines etc. and were concerned about my survival).
I mentioned this to the Rebbe and he said that listening to non-Jewish music can badly affect a sensitive soul resulting in physical illness. (I never told the Rebbe, but at that time, I enjoyed very much to listen to popular non-Jewish music – sometimes, even for hours, it was relaxing, enjoyable and even while working I would often listen to non-Jewish music).
In order to clarify what he meant, I asked; “Does the Rebbe mean that I should only listen exclusively to Jewish or chassidic or Chabad music?”
He answered that listening to Chabad Niggunim is like a healing medicine for the soul and the body. (I am unsure of the exact wording of his answer, but this was and remains my understanding).
I completely stopped listening to non-Jewish music and would make a point to listen to Chabad melodies (at least once a week or more often).
Very shortly after I made that change, the illness went away for good. The treatments and medications had very little or no effect. Stopping to listen to non-Jewish music and listening to Chabad tunes was the medicine which removed the illness.