Nada Yoga is a meditation technique that uses sound to calm the mind. Attention is turned inward to perceive internal sounds. Patience and a receptive attitude can produce a state of calm, openess and awareness. Some practices focus on 'external sounds' such as calming ambient music where attention is directed to hearing in order to quiet the mind. The goal is to hear the 'Ultimate Sound' (para nada), a sound without vibration that manifests as 'OM'.