To reap the most benefits from chanting, one's mind must be clear and focused. Keeping the mind in the present, chanting helps one develop mindfulness. Chanting is not like singing a tune. When chanting, a mantra is often used. A mantra is a repeated word or phrase used to aide in concentration in meditation and believed to expand one's awareness and increase their connection with the spiritual or divine.
As you chant a mantra during meditation, the focus of your meditation is to merge with the vibration of the sound you are chanting and become one with that energy. In this way, you connect with everyone in the world who is chanting that same mantra as well as everyone who has ever chanted that same mantra. In this way you merge and connect with them on a spiritual level.
For me, one of the greatest benefits gained through my meditation practice is awareness of the interconnectedness between our mental, emotional and physical levels it brings. As this awareness grows, it leads to an understanding of the more subtle areas of existence.
So try out some chants, keeping in mind that it is virtually impossible to chant incorrectly. The sound is simply a sound, just vibrations in the air. It is the feeling and intention of love behind it that results in the chant bringing peace and joy.
May your meditation and chanting bring you peace and inner joy.