When you chant, you take the energy of the earth in through your body, magnify it, and send it out to all your relations on the planet. This means you should feel the chant throughout your who...le body, not just your throat. It should cause a vibration that touches all your energy centers.
It does not matter if you think you can not sing. Chanting is a way of centering and sending energy. If you are going to sing a chant, you should show respect for it by learning it before you sing. Listen to the person leading it until you are sure you know the words and the tune. Some chants change words and tune unexpectedly, so don't be too quick to join in. When you are sure of the chant, sing it with gusto. Most chants are repeated in sets of four, with the person who began the chant determining when to end it and signifying this by saying "Ho!
As the day ends, a chant offered to the Sacred Directions, Creator or as an offering for blessings can be quite powerful. May our chants be joined in Spirit as our voices travel to the Celestial Gourd.
Kalpulli Teocalli Ollin