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A '''slide whistle''' is a musical instrument with a tin-whistle-like mouthpiece and a movable piston which can be operated like the slide of a trombone. It produces a clear, musical whistle which varies continuously in pitch. Today it is thought of primarily as a child's toy, or used as a comic sound effect, but it was used seriously in popular music of the 1920s and 1930s.  

A '''slide whistle''' is a musical instrument resembling a tin whistle, but with movable piston which can be operated like the slide of a trombone. It produces a clear, musical whistle which varies smoothly and continuously in pitch. Today it is thought of primarily as a child's toy, or used as a comic sound effect, but it was used seriously in popular music of the 1920s and 1930s.  

Paul Whiteman's band included a slide whistle performer<ref>[http://www.redhotjazz.com/pwo.html Paul Whiteman and His Orchestra]</ref>, heard notably in his hit song ''Whispering.''

Paul Whiteman's band included a slide whistle performer<ref>[http://www.redhotjazz.com/pwo.html Paul Whiteman and His Orchestra]</ref>, heard notably in his hit song ''Whispering.''