What You Are Capable Of

Take Your Voice to Higher Levels
Amazingly, your voice can soar to new heights with a little vocal training and a few exercises. With lots of practice, you might even increase your singing range from two to five octaves! You can sing high with the sopranos or low with the bass singers.

This piece of the puzzle about vocal training will do one of two things: either it will bring back some of the things you already know about vocal training or it will train you in a new area. No matter how you view it, you will be a better informed singer.

How Long to Increase Your Singing Range?
Your voice cannot be forced into a new singing range; it must be trained. You'll need to find the flow in your voice and use your mind to overcome muscular limitations. While training your voice, you'll also decrease vibrating vocal cords, or mass, until your vocal cords dampen. This will decrease the vibrating sounds of the cords. With this type of voice training, you'll train your musculature to obey your mind.

Once you've accomplished these steps, you'll notice a pleasant change in your singing voice. You'll be able to sing easier, higher, longer and with a beautiful singing tone that draws the ear.

Source : http://www.largemart.com/singing/amazing-singing-voice.htm