The whistle register (also called the flageolet or flute register or whistle tone) is the highest register of the human voice, lying above the modal register and falsetto register. This register has a specific physiological production that is different from the other registers, and is so called because the timbre of the notes that are produced from this register are similar to that of a whistle.
In some sopranos, the modal register vocal production may extend into what is usually thought of as the whistle register. With proper vocal training, it is possible for women within all voice types to develop this part of the voice. However, some women are unable to phonate or comfortably produce sound in this register. Children can also phonate in the whistle register as can some men, though McKinney states this to be quite rare.
Read more about Whistle Register: Physiology and Definition, Whistle Register in Children, Uses of The Whistle Register
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