Gregorian chanting is not a type of music but a way of singing in a low tone. It has been used in meditation for centuries by many religions people. Most of the chanting used nowadays relates itself to the meditation music between 900 to 1300 A.D. Primordial sounds are also a kind of chanting, which helps the person to set his mindset right for meditation. The most popular primordial sound is the ‘Om’ which is greatly used in India for meditation.