The Larynx!
Yes, it is in your neck... but theres a bit more too it than that...
This page is just for the mechanics. These are the parts involved for ANY kind of vocal performance...
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These are what is commonly called "vocal chords". They are actually folds of tissue. 
These are the tendons and muscles under the folds. 
The "voice box" or larynx is covered in small muscles to aid in tone production.
Another view...
The muscles of the face also connect to the larynx and can affect tone production. 
This is a crosscut look at the larynx from the inside. The weird dip in the middle is actually where the vocal folds(on the bottom) and the protective folds reside. 
The bone structure, cartilages, and connective tissues for the larynx, hyoid and the trachea. 
The same thing as left, except from the anterior(back). You can see the crycoid and the arytenoids that lengthen the vocal folds. 
More structures of the vocalis. 
A view from above featuring the tongue, the epiglottis and part of the arytenoid cartilages. 
The floating bone that resides just above the larynx.
The abdominals, and the muscles between the ribs that are called the intercostals. 
The lungs, and the source of your air... but you knew that... 
The masticular process. Or, more simply, where your jaw hinges. 
The pharynx, through which the vibrations eminating from the larynx travel to get to the articulators. Questions, comments?
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