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Whistling without the use of an artificial whistle is achieved by creating a small opening with one's lips, usually after applying moisture (licking one's lips or placing water upon them) and then blowing or sucking air through the space. The air is moderated by the lips, curled tongue, teeth or fingers (placed over the mouth or in various areas between pursed lips) to create turbulence, and the curled tongue acts as a resonant chamber to enhance the resulting sound by acting as a type of Helmholtz resonator. By moving the various parts of the lips, fingers, tongue and epiglottis, one can then manipulate the types of whistles produced.
Pucker whistling is the most common form in much Western music. Typically, the tongue tip is lowered, often placed behind the lower teeth, and pitch altered by varying the position of the tongue. Although varying the degree of pucker will change the pitch of a pucker whistle, expert pucker whistlers will generally only make small variations to the degree of pucker, due to its tendency to affect purity of tone. Pucker whistling can be done by either only blowing out or blowing in and out alternately. In the 'only blow out' method, a consistent tone is achieved, but a negligible pause has to be taken to breathe in. In the alternating method there is no problem of breathlessness or interruption as breath is taken when one whistles breathing in, but a disadvantage is that many times, the consistency of tone is not maintained, and it fluctuates.
Many expert musical palatal whistlers will substantially alter the position of the tongue to ensure a good quality tone. Venetian gondoliers are famous for moving the tongue while they whistle in a way that can look like singing. A good example of a palatal whistler is Luke Janssen, winner of the 2009 world whistling competition.
Finger whistling is harder to control but achieves a piercing volume. In Boito's opera Mefistofele the title character uses it to express his defiance of the Almighty.
One of the most well known whistling competitions is the International Whistlers Convention (IWC). This annual event has taken place in Louisburg, North Carolina since 1973. The awards go to whistlers ranging from international male and female, teenage male and female, and even grandchildren. It has been customary for the Governor of the State of North Carolina to sign a declaration declaring the week of the IWC as "Happy Whistlers Week," for citizens and visitors to honor the art of whistling and to participate in the scheduled events.
One of the most prolific whistling competitors is a Virginia-based communications expert, Christopher W. Ullman who has won the competition so many times he is listed in the International Whistling Hall of Fame.
Ullman has won the Grand Championship of the International Whistling Contest three times, in 1996, 1999, and 2000. In 1994, he was the National Grand Champion in the National Whistling Context. In 1999, he was given the Lillian Williams Achievement Award as Whistling Entertainer of the Year.
Ullman has performed in the Oval Office for President George W. Bush and has been featured on The Tonight Show, the Today Show, CBS This Morning as well as performing in front of 60,000 people on the National Mall with the National Symphony Orchestra in Washington DC. He has performed with the Saint Paul Chamber Orchestra, the Indiana Symphony Orchestra, and many others.
Ullman's specialty is whistling “Happy Birthday” to friends and family and practically anyone who asks. The Washington Post reported in April 2017 he had whistled the tune 400 so far that year. “He’s up to 5,000 renditions since he started back in the mid-1990s.” The Post reported Ullman has done the math and “figures he’ll hit an additional 12,000 if he lives to 80.” 
Ullman has been a top communications aid at the U.S. Office of Management and Budget, chief spokesman for the Securities and Exchange Commission, and head of corporate communications for the international investment company the Carlyle Group. In 2017, Ullman published his memoirs, Find Your Whistle, that tells the remarkable story about how he found his whistle as child and how he has shared it with the world.
According to Guinness World Records, the highest pitch human whistle ever recorded was measured at 10,599 Hz, which corresponds to an E9 musical note. This was done by Joshua Lockard in Southlake, Texas, on May 1, 2019. The lowest pitch whistle ever recorded was measured at 174.6 Hz, which corresponds to a F3 musical note. This was accomplished by Jennifer Davies (Canada) at the Impossibility Challenger Games in Dachau, Germany, on 6 November 2006. The most people whistling simultaneously was 853, which was organized at the Spring Harvest event at Minehead, UK on April 11, 2014.
On La Gomera, one of Spain's Canary Islands, a traditional whistled language, Silbo Gomero, is still used. At least nine separate whistling sounds are used to produce usually four vowels and five consonants, allowing this language to convey unlimited words. The language allowed people (such as shepherds) to communicate over long distances in the island, when other communication means were not available. It is now taught in school so that it is not lost among the younger generation. Another group of whistlers were the Mazateco Indians of Oaxaca, Mexico. Their whistling aided in conveying messages over far distances but was used also in close quarters as a unique form of communication with a variety of tones.
Whistling can be used to control trained animals such as dogs. A shepherd's whistle is often used instead.
Whistling has long been used as a specialized communication between laborers. For example, whistling in theatre, particularly on-stage, is used by flymen (members of a fly crew) to cue the lowering or raising of a batten pipe or flat. This method of communication became popular before the invention of electronic means of communication, and is still in use, primarily in older "hemp" houses during the set and strike of a show.
Many performers (also known as siffleurs) on the music hall and Vaudeville circuits were professional whistlers, the most famous of which were Ronnie Ronalde and Fred Lowery. The term puccalo or puccolo was coined by Ron McCroby to refer to highly skilled jazz whistling.
Whistling is featured in a number of television themes, such as Lassie, The Andy Griffith Show and Mark Snow's title theme for The X-Files. It also prominently features in the score of the movie Twisted Nerve, composed by Bernard Herrmann, which was later used in Quentin Tarantino's Kill Bill.
Prominent in classic songs such as Bobby McFerrin's "Don't Worry, Be Happy", Otis Redding's "(Sittin' On) The Dock of the Bay", The Bangles's "Walk Like an Egyptian", Guns N' Roses's "Patience" and Scorpions' "Wind of Change", whistling has also been integrated in many contemporary pop hits such as Flo Rida's "Whistle", Selena Gomez's "Kill Em With Kindness", Florida Georgia Line's "Sun Daze", Foster the People's "Pumped Up Kicks", Sebalter's Hunter Of Stars, Joci Papai's Az Apam, Maroon 5's "Moves Like Jagger", Edward Sharpe and the Magnetic Zeros' "Home", OneRepublic's "Good Life", Adam Lambert's "Ghost Town", Kanye West's "All Day", Peter Bjorn and John's "Young Folks", The Seekers "Georgy Girl", Professor Longhair's "Go to the Mardi Gras", and Smash Mouth's "All Star". Also the novelty song "I Was Kaiser Bill's Batman".
There are good Whistlers in India who have started whistling on Bollywood songs, there are various Whistling groups in India, who whistle on the well known Bollywood songs
Whistling is often used by spectators at sporting events to express either enthusiasm or disapprobation. In the United States and Canada, whistling is used much like applause, to express approval or appreciation for the efforts of a team or a player, such as a starting pitcher in baseball who is taken out of the game after having pitched well. In much of the rest of the world, especially Europe and South America, whistling is used to express displeasure with the action or disagreement with an official's decision, like booing. This whistling is often loud and cacophonous, using finger whistling.
In the UK there is a superstitious belief in the "Seven Whistlers" which are seven mysterious birds or spirits who call out to foretell death or a great calamity. In the 19th century, large groups of coal miners were known to have refused to enter the mines for one day after hearing this spectral whistling. The Seven Whistlers have been mentioned in literature such as The Faerie Queene by Edmund Spenser, as bearing an omen of death. William Wordsworth included fear of the Seven Whistlers in his poem, "Though Narrow Be That Old Man's Cares". The superstition has been reported in the Midland Counties of England but also in Lancashire, Essex, Kent, and even in other places such as North Wales and Portugal.
In Russian and other Slavic cultures, and also in Romania and the Baltic states, whistling indoors is superstitiously believed to bring poverty ("whistling money away"), whereas whistling outdoors is considered normal. In Estonia it is also widely believed that whistling indoors may bring bad luck and therefore set the house on fire.
Theater practice has plenty of superstitions: one of them is against whistling. A popular explanation is that traditionally sailors, skilled in rigging and accustomed to the boatswain's pipe, were often used as stage technicians, working with the complicated rope systems associated with flying. An errant whistle might cause a cue to come early or a "sailor's ghost" to drop a set-piece on top of an actor. An offstage whistle audible to the audience in the middle of a performance might also be considered bad luck.
Transcendental whistling (chángxiào 長嘯) was an ancient Chinese Daoist technique of resounding breath yoga, and skillful whistlers supposedly could summon supernatural beings, wild animals, and weather phenomena.
Children's television cartoon shows
- Peppa Pig: "Whistling"
- Dora the Explorer: "Dora the Talented Whistler"
- The Justine Clarke Show': "Whistle with Me"
- Glenn Benzo: "Whistling"
- My Friends Tigger and Pooh:You Ain't Just Whistlin' Tigger.
- Alice J. Shaw, professional whistler
- Bird vocalization § Bird song and music
- Boatswain's call
- Hand flute
- Irish whistling champions
- Piedmont High School (California) § Bird Calling Contest
- Puirt à beul
- Silbo Gomero language
- Slide whistle
- Tin whistle
- Whistle Pops
- Whistle register
- Whistled language
- "How to Whistle With Your Fingers". The Art of Manliness. April 8, 2012. Retrieved March 7, 2017.
- Jessica Satherly (April 28, 2009). "King of whistles challenges Boyle for top talent". Metro (British newspaper).
- "IWC Main Website".
- "Guinness World Records, Highest note whistled".
- "Guinness World Records, Lowest note whistled".
- "Guinness World Records, Most people whistling".
- Busnel & Classe 1976
- Hughes, Maureen. A History of Pantomime, p. 31 (2013).
- Asbury, Nick. Exit Pursued by a Badger: An Actor's Journey Through History with Shakespeare, p. 134 (Oberon Books 2009).
- Woodward, Agnes: Whistling as an Art (Carl Fischer, New York 1923)
- Page x. These are written pitches, presumably sounding an octave higher and corresponding to C5-C7 &c
- Sheff, David. "They Laughed When Ron McCroby Puckered Up, but Now He's Whistlin' Jazz, Not Dixie", People (August 8, 1983).
- Snow called it the "signature whistle" that gave the music part of its "scariness". Greiving, Tim (January 22, 2016). "As 'X-Files' Returns, Meet The Man Behind The Theme Song". NPR. Retrieved January 23, 2016.
- Tate (June 30, 2009). "Things Fall Apart – Ch 2". Washington State School for the Blind. Retrieved May 20, 2012.
- "Daily Traditions". Fantastic Asia Ltd. Retrieved May 20, 2012.
- "Belide Tribe 22.000". Indonesia Traveling. Retrieved May 20, 2012.
- GaboudAchk (January 24, 2009). "Evil Eye...... Growing Up". Experience Project. Retrieved May 20, 2012.
- Wright, Elizabeth Mary (1913). Rustic speech and folk-lore. H. Milford. p. 197.
- William Knight, ed. (1883). The poetical works of William Wordsworth. 4. Edinburgh: William Paterson. pp. 73–76.
- "Notes and Queries, Fifth series". 2. London: Oxford Journals, Oxford University. October 3, 1874: 264. Cite journal requires
- Taylor, Archer (April 1917). "Three Birds of Ill Omen in British Folklore – III. The Seven Whistlers". Washington University Studies. St Louis, Missouri: Washington University. IV (2): 167–173.
- Passport magazine article
- Gonzalez, N. V. M. "Whistling Up the Wind: Myth and Creativity." Philippine Studies: Historical and Ethnographic Viewpoints 31.2 (1983): 216–226.
|Wikimedia Commons has media related to whistling.|
- Stekelenburg, A.V. van. "Whistling in Antiquity", Akroterion, vol. 45, pp. 65–74 (2000).
- Kahn, Ric. "Finally, whistling is cool again", Boston Globe, August 27, 2007
- Alexandra Petri. "Not just anyone can whistle, at the 2013 International Whistling Convention", Washington Post (April 29, 2013).
- Casey, Liam. "Toronto whistler blows past the competition at international contest", Toronto Star (May 3, 2013).
- International Whistlers Museum in Louisburg, North Carolina
- Indian Whistlers Association (IWA)
- Professional whistler Dave Santucci provides whistling performance videos and whistling tutorial videos (YouTube)
- "History of Musical Whistling" given by Linda Parker Hamilton at the 2012 International Whistlers Convention (YouTube)
- Northern Nightingale site with whistling lessons and links to other whistlers' sites
- Biography page of whistling performer Robert Stemmons with links to other whistlers' sites