Topmusicanswers
You can't sing that low because your vocal cords aren't built to vibrate freely at that pitch. Often times a younger child or young teenage girl can't sing low because their cords are underdeveloped. As they mature their vocal cords mature also. Then they can hit the lower notes their genetics will allow.
Why can't I sing low after singing high?
what could this be? After prolonged singing in the upper range, many singers experience a slight weakening of the lower pitches. This just has to do with how warmed up and active the muscles are I think--most people can also sing lower at the very beginning of the day or after sleeping for at least a few hours, too.
Why can't Some people sing high notes?
Your larynx, or “voice box”, houses the vocal cords and has several groups of muscles that raise or lower it when you swallow or yawn. But many singers raise their larynx unconsciously when they sing high notes. And if the larynx is too high on your high notes, it can actually cause you to strain.
