Nada means the flow of sound and Yoga means Union. Nada Yoga is the process of the union of the individual mind with cosmic consciousness through the flow of sounds.
When the river of consciousness is impeded by the ego, Nada or the inner/cosmic vibrations can remove the obstruction of the mind, allowing the river of individual consciousness to unite with its source, the ocean of pure consciousness.
Nada yoga is an ancient metaphysical practice of inner transformation through sound and tone, based on the premise that the entire cosmos and everything in it is made of vibration. A mystical exploration of deep listening and connecting to pure presence in every now moment through sound, meditation and movement. As a fractal we move our awareness from being an aspect of the whole towards being the witness of the aspect that is the whole.
Samadhi is the experience of pure consciousness that transcends the mind and body. On the path to experiencing pure consciousness an individual discovers the wisdom of the body, emotional and cognitive intelligence, and the union of body and mind (atman or soul), and the expansion of Atman into Nada Braham or Shabd Braham (God of Sound or Word).