Mantra Jaap, or chanting, is a powerful tool that people not only please the gods, but also raise vibrations and energy around them, helping them cure in one way or another. For some people and devoted, the mantra is quite positive, which gives them some happiness, and for some other results they see after regular singing are really joyful.
If you chant the mantra with full faith and attention, you not just repeat the words, but also align your thoughts, energy and life (breathing) with divine.