Purpose of the articulators: 

The articulators (the parts of the vocal tract above the larynx consisting of tongue, palate, cheek, lips, etc.) articulate and filter the sound emanating from the larynx and to some degree can interact with the laryngeal airflow to strengthen it or weaken it as a sound source.

The vocal folds, in combination with the articulators, are capable of producing highly intricate arrays of sound. 
The tone of voice may be modulated to suggest or to express emotions such as anger, surprise, hate, love, or happiness.

A Voice is a sound wave that can create frequencies which can affect peoples ways of thinking, and acting. The effect of a voice can create a negative energy (frequency) or a positive energy (frequency) depending on the motives of the person from whence the voice is coming from. 
The voice which derives from an evil source or person also carries negative energies with a negative frequency or influency over others. But on the other hand, the voice which derives from a person with good motives and a good heart towards others also carries positive energies and a positive frequency.
Singers use the human voice as an instrument for creating music.

Article written by conscious lifestyle/part taken from wikipedia.

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