Although we are all humans, we have different voice as we are different in various aspects. Anyone would be amazed to hear the voice of Mr. Amitabh Bachan. Some are gifted with a rich baritone voice like him. Our voices depends on the our voice box, the height, the build, the early training and guidance, the lung capacity etc. Often we note children's voice change when mature or go past puberty. This is often seen in choir singing children or children who sing songs suddenly find that they do not sound as good as they were a few years earlier.