Types of Whistle
Many types exist, small mouth blown whistles for various functions from toys to hunting using bird and fowl calls type whistles, to professional whistles as police, boatswain's pipe, military, sports whistles (also called pea whistles), to much larger steam or air preasure operated ones as train whistles, which are steam whistles specifically designed for use on locomotives and ships. Although almost all whistles have some musical character, common whistles are not usually considered musical instruments, since they cannot play a melody, unless used as a – very shrill and loud – noise and rhythm instrument. However, musical whistles exist, including various 2-octave musical instruments known as tin whistles (sometimes called pennywhistles or low whistles), as well as the calliope (an array of separately actuable steam whistles), organ pipes and the recorder. Pea whistles are used in jazz and Latin music for rhythm, much as a percussion instrument is; children often use them as a toy music instrument. There is also a more diverse type of whistle used for giving commands to sheepdogs at work, which can emit almost any tone the shepherd wishes, in order to signal different commands. This whistle is known as a shepherd's whistle.
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