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Concept
Whistle register
Summary
The whistle register (also called the flute register or flageolet register) 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 is 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.
The whistle register is the highest phonational register, that in most singers begins above the soprano "high D" (D6 or 1174.6 Hz) and extends to about an octave above (D7 or 2349.3 Hz). It is created by using only the back of the vocal folds. The lower part of the whistle register may overlap the upper parts of the modal and falsetto registers, making it possible for singers to phonate these notes in different ways. However, fundamentally, the whistle register is most commonly used to produce pitches above D6. As with the other vocal registers, the whistle register does not begin at the same point within every voice, and there are rare voices that can extend the whistle register much higher or lower than the range listed above. For example, most operatic coloratura sopranos can sing up to the "high" F above "high" C without entering into the whistle register. Cleo Laine from the United Kingdom and Yma Sumac, from Peru, are two singers (contralto and soprano respectively) with extreme vocal ranges.
The physiology of the whistle register is the least understood of the vocal registers. Unlike other types of vocal production, it is difficult to film the vocal cords while they are operating in this manner as the epiglottis closes down over the larynx, and the resonating chamber assumes its smallest dimensions. It is known that when producing pitches in this register, vibration occurs only in some anterior portion of the vocal folds. This shorter vibrating length naturally allows for easier production of high pitches.
Official source
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