How Do We Sing?

There is no musical instrument made that can compare with the human voice as regards the fineness of its strings or its ability to change range and achieve richness of tonal quality.
The human vocal apparatus is quite a complicated mechanism. First, let us start with the larynx. This contains the vocal apparatus and consists of a framework of cartilages, which you can feel in the front of your neck. Inside the larynx are two "arytenoid cartilages', to which are attached our "vocal cords". Sixteen different muscles move these vocal cords, making them tense or slack, just as a violinists controls the tension of his strings. The vocal cords can assume about 170 positions!
When a certain amount of air is blown upwards by the diaphragm and other muscles, the vocal cords begin to vibrate, and this makes the column of air in the respiratory passages vibrate, too. We hear the vibration of the column of air as a sound. If the vocal cords are not too tense, so they vibrate about 80 times per second, the sound waves are heard as deep tones. If the cords are tensed so that they vibrate about 1,000 times per second, we hear the sound waves as high tones.
The pitch of the human voice depends on the length of the vocal cords. The range and quality of a voice depend on the form and size of the resonating spaces. These include part of the vocal cord, and the windpipe, the lungs, the thorax and pharynx, the oral and nasal cavities, and the nasal sinuses. People with beautiful voices have their resonating spaces shaped in such a way that they vibrate "musically".

It is all about the tones that u've got , u should have Talent for singing and u should control ur voice and u can learn how to sing

When singing, you need to do proper breathing techniques before you get up and perform. These techniques include: Siren: This technique warms up your voice and helps you to hit all of those notes. Sob: Sob is an exercise to help you get your voice perfect and fit you for any type of song. Your tongue needs to be in the position of an “E” and the aim of this exercise is to push all of the air out of your diaphragm through silent breathing.  There are many other exercises, but these are just a few.
Your vocal chords are the mechanisms, which create your voice. Singing works just like talking, except, your voice runs smoother and sounds musical. When you begin to sing, the notes pass through the vocal folds (chords). These are located over the larynx and are responsible for making sound. They also regulate how much breath goes in and out of the lungs. There are sixteen different muscles, which move these folds and make them tense or slack. These can be moved into 170 different positions.
When the diaphragm lets out air, the vocal chords vibrate and make a column of air in which the respiratory passages vibrate. We hear this vibration as a sound.