Whistling

Whistling is the production of sound by means of a constant breath of air through pursed lips.

Many people are able to whistle, that is, to produce sound by forcing air through their lips which are shaped to create the required turbulence and a resonant chamber (the mouth). A more intense whistle may be created using the fingers to shape the opening - this allows the mouth to relax permitting a much more forceful stream to be blown through. This type of whistle is usually called a wolf-whistle.

Whistling can be varied in pitch to produce music; many performers on the Music Hall and Vaudeville were professional whistlers.

There are also whistled languages.

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