Nada yoga is described in the "Hatha Yoga Pradipika" as one of the most powerful and fruitful meditation techniques to calm the mind. Using music and sounds to connect to a higher state of consciousness is a very common practice in Hindu spiritual traditions, where many of the deities are musicians: Krishna plays the flute, Saraswati plays the veena, and Ganesha created the tabla drums.
The practice of Nada yoga can start with listening to external sounds. Calming, beautiful and preferably instrumental music should be chosen. The practitioner should sit quietly and focus all their attention on the chosen music. Once the practitioner becomes aware of their inner sounds, their full concentration should be centered on those sounds. As the meditation becomes more and more about listening to the inner sounds, the external music can be gradually turned down.
One's internal sounds can often be perceived as bells, flutes or an electric hum. Some of these sounds are actually the sounds of the body, such as the blood flowing or the energy of the nerves. An individual's anahata sounds connect directly with the sound of the energy center of the body.