Also called focusing the voice, or learning placement.

Ring is an aural quality found in strong, attractive voices that project well (ie are easily heard). It is a golden, shimmering quality that pleases the ear subconsciously - audiences enjoy voices with ring, whether they can identify the specific element or not. Computerised spectral analysis has shown that ring is actually a very high harmonic being sounded by the voice, similar in frequency to the highest notes on the keyboard.

The way a singer perceives ring in their own voice is mainly through the sympathetic vibrations that occur in various pockets of the skull, around the eyes and nose. This head resonance is a subtle sensation at first, but as you become sensitive to it it becomes a reliable means of producing ring and brilliance, even when you may not be able to hear your own external voice clearly, such as because of the band or orchestra, or the other singers next to you.

Assuming the throat is open and the breath support strong, it is helpful to think the sound forward, and allow the bright resonance to occur, almost of its own accord, rather than seeking to have too much control in a physical sense. Each voice has its own personality, and must be allowed to function freely if ring or focus is to occur. A voice that isn't focussed will sound dull and uninteresting, and not carry to the back of the audience.