Everything in our physical world, each structure and form, carries a unique vibration, or tone. This vibration determines the nature and essence of that form.
When you experience physical illness or energetic imbalance, it is a sign that, at some level, there is a disharmony in the resonance between vibrational levels in your energy field.
Energy healing with sound seeks to bring in a harmonious resonance (in this case, with singing bowls and bells) to help re-align disharmonious frequencies and restore your balance once again.
This new state of harmony can then promote healing at the physical level, as deep stress is neutralized in cells and organs, enabling them to return to a healthy state.