This may be caused by singing or talking at a pitch outside the person's natural vocal range, stress, fatigue, emotional tension, or the physical changes associated with puberty.
An instance of a voice crack (when associated with puberty) lasts for only a moment and generally occurs less frequently as a person grows into maturity.
Cavities in the sinuses, the nose, and the back of the throat grow bigger, thus creating more space within the head to allow the voice to resonate.
Historical changes in the average age of puberty have had profound effects on the composing of music for children's voices.
The British cathedral choir ideal remains based on boy sopranos (or trebles), with the alto part executed by adult countertenors.
[5] Mozart's Exultate Jubilate, Allegri's Miserere and parts of Handel's Messiah were written for this voice, whose distinctive timbre was widely exploited in Baroque opera.