This is a branch of yoga which deals with the effects of sound on body and mind.
Mantra is a short and repetitive prayer. Any combination of words will be effective if one has the knowledge and experience of how vibrations shake the spinal column and relax all the nerve fibres attached to it.
The endocrine glands through vibration begin to relax and resume their proper functions which in turn helps the body to naturally cure itself.The mind reacts to sound, becomes calm and all mental disorders disappear.
With this approach all psycho-somatic diseases can be cured without a drop of medicine.This is a pleasant and way to practice.