Nāda yoga is an ancient Indian metaphysical system. It is both a philosophical system, a medicine, and- as the name suggests- a form of yoga. The system's theoretical and practical aspects are based on the premise that the entire cosmos and all that exists in the cosmos, including human beings, consists of sound 
vibrations, called nāda. This concept holds that it is the sound energy in motion rather than of matter and particles which form the building blocks of the cosmos.
Nāda yoga is also a way to approach with reverence and respond to sound. Sound and music is in this context, something more than just the sensory properties and sources of sensuous pleasure, sound and music is considered also to play the role as a potential medium to achieve a deeper unity with both the outer and the inner cosmos.
Nāda yoga's use of sound vibrations and resonances are also used to pursue palliative effects on various problematic psychological and spiritual conditions. It is also employed to raise the level of awareness of the postulated energy centers called chakra.
Music has been used by most Indian saints, prophets as an important and powerful tool in the quest for the achievement of nirvana.
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