It's not an inevitable interaction. Remember, your music comes from your own field. Healers generally stop treatment when they have reached resonance. Certain instruments affect the field at different levels. For instance, the flute, cello and viola produce focused tone colors.
Harpists are generally ungrounded people.
They'll become well if they bring in a more complete spectrum in their own field, while keeping the high vibrations in their music. They get sick if they focus on only one dimension, and then the field and body deteriorate because of the multidimensional nature. Dramatic symphonies with deep bass and percussive sounds may help to ground harpists. One of our most difficult challenges is to embrace the power of the divine within.