Chest voice or Voce di Petto is a term used in relation to the muscular function of the larynx and should not be connected to the various concepts of resonance. It is a functional product of the larynx. i.e. it is the predominance of the thyro-arytenoid muscles of the larynx. Giving to the sound particular characteristics that differ from head voice. (True resonance is the amplification of sound. 95% of sound is resonated in the pharynx. Manipulating ones voice to receive sympathetic vibrations is not true resonance. there is no amplification of sound, just sensations. See other videos for more info.)
Chest voice sound occurs throughout the male voice because of the predominance of these muscles.
In pop singing the female chest voice is extended. For Operatic sopranos the chest voice is used at the lower half of the female range. The chest voice is generally used for the lowest notes up to, or around the F above low C.
The chest voice is indispensable for the function of the voice, the bulk of the vocal cords are its function. I.e. The thyro-arytenoid muscles shorten and thicken the vocal cords. Omitting chest voice limits the size and volume of the voice, making the voice feeble. In head voice, chest voice participation is extremely important. As explained in my other videos, the chest voice gives core or squillo to the sound. In this video you can hear how chest function plays its role in the head voice. It gives the sound clarity and solidifies the middle register. It also invigorates the upper notes.
