Sound plays a more vital role in human health and learning than we ever imagined. Beginning with foetal development, sound waves "charge" the brain, stimulating neurodevelopment. Throughout life, sound continues to fuel the nervous system. THE POWER OF SOUND explains why we need certain "nutrient" sounds for optimum health and describes how auditory dysfunction occurs when we are overexposed to noise pollution, trauma or stress. In addition to preserving good health, sound can, also, heal. The ability to process, understand and communicate with our world is largely dependent upon a delicate combination of auditory functions. New music and sound techniques--including filtered Mozart, entrained rhythms and resonant frequencies--can retrain the auditory system to take in a full spectrum of sound. Improved hearing can impact speech and language skills, short-term memory, stress-related conditions and low immune function.