When two different frequencies are played to the left and right side of the ear the brain detects the difference and this difference becomes a third frequency that is heard. Depending on the frequency it can entrain the brain into certain brain states. For example, a relaxed meditative state, or an alert, creative state.
Have a look at the work of ‘Healing Vibrations’ here:-
A sound bath is a ceremony where a sound healing practitioner creates a sonic soundscape for others, with the intention of producing sounds which take participants on a journey towards feeling healed and soothed.
Sound healing, or sound therapy is the use of either the voice or instruments to create a space where we can hear and feel the vibrational energy of sound. The effects can be therapeutic on many levels; physically, emotionally and spiritually.
Here is an example of a sound bath from Sara Auster on YouTube: