Mantra 'Om Namah Shivaya' is chanting by Sri Sri Ravi Shankar (The Art of Living). This fragment has length about 1 minute and can be played in a loop. It is slow chant pranayam: only three breaths per minute fot the one cycle of slow chanting of this mantra (usually we doing 16 breaths per minute!). This technique (Mantra-Pranayama) allows you to relax your mind.
Note: This practice, like any other of yoga, it is recommended to learn and doing under the guidance of a guru (teacher). If you are not trained in chanting mantras or not passed the "The Art of Living" courses, it is proposed to first find a guru (teacher) and undergo training courses.
Significance of the ‘Om Namah Shivaya’ Mantra
Om Namah Shivaya is one of the most powerful mantras. Chanting this mantra builds the energy in your system and also clears the environment. (This mantra is not only limited to Hinduism, as Hinduism is not a religion but a way of life). People have been chanting this mantra for thousands of years.
Om Namah Shivaya, these words are very important because ‘Na’, ‘Ma’, ‘Shi’, ‘Va’, ‘Ya’, these five letters indicate the five elements – Earth, Water, Fire, Air and Ether and 'Om' is the sound of the universe. ‘Om’ means peace and love. So the ‘Om Namah Shivaya’ chanting is done to harmonize the five elements in the environment. When there is peace, love and harmony in all the five elements, then there is bliss and there is joy!
// "Understanding Shiva" e-Book (The Art of Living - https://www.artofliving.org/what-is-shiva)