Native American flute
The Native American flute is a musical instrument and flute that is held in front of the player, has open finger holes,
and has two chambers: one for collecting the breath of the player and a second chamber which creates sound.
The player breathes into one end of the flute
without the need for an embouchure.
A block on the outside of the instrument
directs the player's breath from the first chamber—called the slow air chamber—into the second chamber—called the sound chamber.
The design of a sound hole at the proximal end of the sound chamber causes
air from the player's breath to vibrate.
This vibration causes a steady resonance of air pressure
in the sound chamber that creates sound.Native American flutes comprise a wide range of designs, sizes, and variations—far more varied than most other classes of woodwind instruments.

Names
The instrument is known by many names. Some of the reasons for the variety of names include: the varied uses of the instrument (e.g. courting),
the wide dispersal of the instrument across language groups and geographic regions,
legal statutes (see the Indian Arts And Crafts Act),
and the Native American name controversy.
Native American names for the flute include:

Cheyenne: tâhpeno
Chippewa: bĭbĭ'gwûn
Dakota: ćotaŋke
Kiowa: do'mba'
Lakota: Šiyótȟaŋka
Opata: bícusirina (Teguima language)
Unami: achipiquon (Lenape)
Zuni: Tchá-he-he-lon-ne, lit. 'sacred warbling flute'Alternative English-language names include:
American Indian courting flute,courting flute,Grandfather's flute,Indian flute,love flute,Native American courting flute,Native American love flute,Native American style flute (see the Indian Arts And Crafts Act),
North American flute,Plains flute,
and Plains Indian courting flute.Names in other languages include:

Bavarian: Indianafletn
Dutch: Indiaans-Amerikaanse fluit
Esperanto: indiĝena amerikano fluto
French: Siyotanka
German: Indianerflöte
Hawaiian: Papa ʻAmelika ʻohe kani
Japanese: ネイティブアメリカンフルート, romanized: Neitibuamerikanfurūto
Korean: 인디언 피리, romanized: indieon pili
Polish: Flet indiański
Russian: Пимак, romanized: pimak

Naming conventions
By convention, English-language uses of the name of the instrument are capitalized as "Native American flute". This is in keeping with the English-language capitalization of other musical instruments that use a cultural name, such as "French horn".The use of abbreviations (e.g. "NAF", "NASF") is discouraged.The prevalent term for a person who plays Native American flutes is "flutist". This term predominates the term "flautist". "Flute maker" is the predominant term for people who "craft" Native American flutes.

Organology
The instrument is classified in the 2011 revision of the Hornbostel–Sachs system by the MIMO Consortium
as 421.23—Flutes with internal duct formed by an internal baffle (natural node, block of resin) plus an external tied-on cover (cane, wood, hide). This HS class also includes the Suling.
Although Native American flutes are played by directing air into one end, it is not strictly an end-blown flute,
since the sound mechanism uses a fipple design
using an external block that is fixed to the instrument.The use of open finger holes (finger holes that are played by the direct application and removal of fingers, as opposed to keys) classifies the Native American flute as a simple system flute.

History
There are many narratives about how different Indigenous peoples of the Americas invented the flute. In one narrative, woodpeckers pecked holes in hollow branches while searching for termites; when the wind blew along the holes, people nearby heard its music. Another narrative from the Tucano culture describes
Uakti, a creature with holes in his body that would produce sound when he ran or the wind blew through him.
It is not well known how the design of the Native American flute developed before 1823.
Some of the influences may have been:

Branches or stalks with holes drilled by insects that created sounds when the wind blew.
The design of the atlatl.
Clay instruments from Mesoamerica.
The Anasazi flute developed by Ancestral Puebloans of Oasisamerica.
Experience by Native Americans constructing organ pipes as early as 1524.
Recorders that came from Europe.
Flutes of the Tohono O'odham culture (often referred to by the archaic exonym "Papago flutes"). Although crafted by a Native American people, these instruments are not strictly Native American flutes since they do not have an external block. In place of the block, the flue is formed by the player's finger on top of the sound mechanism. This style of flute may have been a precursor to, or one of the influences for, the Native American flute.Flutes of the Akimel O'odham culture (often referred to by the archaic exonym "Pima flutes"). These flutes may have directly evolved from flutes of the Tohono O'odham culture, with the addition of a piece of cloth over the sound mechanism to serve as the external block.It is also possible that instruments were carried from other cultures during
migrations.Flutes of the Mississippian culture have been found that appear to have the two-chambered design characteristic of Native American flutes. They were constructed of river cane. The earliest such flute is curated by the Museum Collections of the University of Arkansas, Fayetteville. It was recovered in about 1931 by Samuel C. Dellinger and more recently identified as a flute by James A. Rees, Jr. of the Arkansas Archeological Society. The artifact is known colloquially as "The Breckenridge Flute" and was conjectured to date in the range 750–1350 CE. 
This conjecture proved to be accurate when, in 2013, a sample from the artifact yielded a date range of 1020–1160 CE (95% probability calibrated date range).The earliest extant Native American flute crafted of wood was collected by the Italian adventurer Giacomo Costantino Beltrami in 1823 on his search for the headwaters of the Mississippi River. It is now in the collection of the Museo Civico di Scienze Naturali in Bergamo, Italy.

Construction
Components
The two ends of a Native American flute along the longitudinal axis are called the 
head end (the end closest to the player's mouth—also called the North end, proximal end, or top end)
and the foot end (also called the bottom end, distal end, or South end).
The Native American flute has two air chambers:
the slow air chamber (also called the SAC, compression chamber, mouth chamber,
breath chamber, first chamber, passive air chamber, primary chamber, or wind chamber)
and the sound chamber (also called the pipe body,
resonating chamber, tone chamber, playing chamber, or variable tube).
A plug (also called an internal wall, stopper, baffle, or partition)
inside the instrument separates the slow air chamber from the sound chamber.
The block on the outside of the instrument is a separate part that can be removed.
The block is also called the bird, the fetish, the saddle, or the totem.
The block is tied by a strap onto the nest of the flute.
The block moves air through a flue
(also called the channel, furrow, focusing channel, throat, or windway)
from the slow air chamber to the sound chamber.
The block is often in the shape of a bird.Note that flutes of the Mi'kmaq culture are typically constructed from a separate block, but the block is permanently fixed
to the body of the flute during construction (typically with glue).
Even though these flutes do not have a movable block, they are
generally considered to be Native American flutes.
The precise alignment and longitudinal position of the block is critical to getting the desired sound from the instrument.
The longitudinal position also has a modest effect on the pitches produced by the flute,
giving the player a range of roughly 10–40 cents of pitch adjustment.
The slow air chamber has a mouthpiece and breath hole for the player's breath.
Air flows through the slow air chamber and up the ramp, through the exit hole, and into the flue.
The slow air chamber can serve as a secondary resonator, which can give some flutes a distinctive sound.

The sound chamber contains the sound hole, which creates the vibration of air that causes sound when the airflow
reaches the splitting edge.
The sound hole can also be called the whistle hole, the window, or the true sound hole ("TSH").
The splitting edge can also be called the cutting edge, the fipple edge, the labium, or the sound edge.
The sound chamber also has finger holes that allows the player to change the
frequency of the vibrating air.
Changing the frequency of the vibration changes the pitch of the sound produced.
The finger holes on a Native American flute are open, meaning that fingers of the player cover the finger hole
(rather than metal levers or pads such as those on a clarinet).
This use of open finger holes classifies the Native American flute as a simple system flute.
Because of the use of open finger holes, the flutist must be able to reach all the finger holes on the instrument with their fingers,
which can limit the size of the largest flute (and lowest pitched flute) that a given flutist can play.
The finger holes can also be called the note holes, the playing holes, the tone holes, or the stops.
The foot end of the flute can have direction holes.
These holes affect the pitch of the flute when all the finger holes are covered.
The direction holes also relate to (and derive their name from) the Four Directions of
East, South, West, and North found in many Indigenous American stories.
The direction holes can also be called the tuning holes or wind holes.
In addition to the Components of the Native American flute diagram shown above with English-language labels, diagrams are available with labels in
Cherokee,
Dutch,
Esperanto,
French,
German,
Japanese,
Korean,
Polish,
Russian,
and
Spanish.

Spacer plate
An alternate design for the sound mechanism uses a spacer plate to create the flue.
The spacer plate sits between the nest area on the body of the flute and the removable block.
The spacer plate is typically held in place by the same strap that holds the block on the instrument.
The splitting edge can also be incorporated into the design of the spacer plate.
The spacer plate is often constructed of metal, but spacer plates have been constructed of wood, bark, and ceramic.
When positioning and securing the removable block with the strap,
the use of a spacer plate provides and additional degree of control over the sound and tuning of the flute.
However, it also adds a degree of complexity when performing the task of securing both the block and the spacer plate.

Plains style vs. Woodlands style
Various sources describe attributes of Native American flute that are termed "Plains style" and "Woodlands style".
However, there is no general consensus among the various sources
about what these terms mean.
According to various sources the distinction is based on:

whether the flute uses a spacer plate to create the flue of the instrument,
whether the flue is in the body of the flute or the bottom of the block,
the sharpness of the angle of the splitting edge,
whether the finger holes are burned or bored into the body of the flute,
the design of the mouthpiece (blunt and placed against the lips vs. designed to go between the lips),
the timbre of the sound of the flute, or
details of the fingering for the primary scale.

Branch flutes
While many contemporary Native American flutes are crafted from milled lumber, some flutes are crafted from a branch of a tree. The construction techniques vary widely, but some makers of branch flutes will attempt to split the branch down a centerline, hollow out the inside, and then mate the halves back together for the completed flute.

Double and multiple flutes
A double Native American flute is a type of double flute. It has two sound chambers that can be played simultaneously. The two chambers could have the same length or be different lengths.
The secondary sound chamber can hold a fixed pitch, in which case the term "drone flute" is sometimes used. The fixed pitch could match the fingering of the main sound chamber with all the finger holes covered, or it could match some other pitch on the main sound chamber.
Alternately, various configurations of finger holes on the two sound chambers can be used, in which case terms such as "harmony flute" or "harmonic flute" are sometimes used.
Extending the concept, Native American flutes with three or more chambers have been crafted. The general term "multiple flute" is sometimes used for these designs.

Dimensions
Some Native American flutes constructed by traditional techniques were crafted using measurements of the body.
The length of the flute was the distance from inside of the elbow to tip of the index finger.
The length of the slow air chamber was the width of the fist.
The distance between the sound hole and first finger hole was the width of the fist.
The distance between finger holes would be the width of a thumb.
The distance from the last finger hole to the end of the flute was the width of the fist.Flute makers currently use many methods to design the dimensions of their flutes.
This is very important for the location of the finger holes, since they control the pitches of the different notes of the instrument. Flute makers may use calculators to design their instruments, or use dimensions provided by other flute makers.

Materials
Native American flutes are traditionally crafted of a wide range of materials, including
wood (cedar, juniper, walnut, cherry, and redwood are common),
bamboo, saw grass, and river cane. Flute makers from Indigenous cultures would often use anything that could be converted or made into a long hollow barrel, such as old gun barrels.Poetic imagery regarding the covenant between flute maker and player
was provided by Kevin Locke in the Songkeepers video:
The flute maker has to take that cedar, split it open, and remove that beautiful, straight-grained, aromatic, sweet, soft, deep-red heart of the cedar. And then they will re-attach both halves and put the holes in. And so the covenant or reciprocal agreement is that the flute player will instill the heart back into the wood — put their heart back in there.
Contemporary Native American flutes continue to use these materials, as well as plastics, ceramic, glass, and more exotic hardwoods such as ebony, padauk, and teak.
Various materials are chosen for their aromatic qualities, workability, strength and weight, and compatibility with construction materials such as glue and various finishes. Although little objective research has been undertaken, there are many subjective opinions expressed by flute makers and players about the sound qualities associated with the various materials used in Native American flutes.

Physical and mental benefits of the flute
Heart rate variability
One study that surveyed the physiological effects of playing Native American flutes found a significant positive effect on heart rate variability, a metric that is indicative of resilience to stress.

Music therapy
The Native American flute is still used today in Music Therapy settings.
Known as Ojibwe music, usage of the flute is extremely beneficial for 
hospice, cancer, and cardiac patients to assist in managing anxiety, restlessness, fear, and pain. 
Flutes can provide a source of rehabilitation and encourage a sense of accomplishment. 
It guides patients in taking a deep breath and using controlled exhalations to blow through the flute,
helping with exercising the lungs.

Ergonomics
Contemporary Native American flutes can take ergonomic considerations into account,
even to the point of custom flute designs for individual flute players.
However, the ergonomic issues related to these instruments are not well-studied and
ergonomic designs are not widespread; one study reported that 
47–64% of players reported physical discomfort at least some of the time,
while over 10% of players reported moderate discomfort on an average basis.

Sound and tuning
The predominant scale for Native American flutes crafted since the mid-1980s (often called "contemporary Native American flutes") is the pentatonic minor scale. The notes of the primary scale comprise the
root, 
minor third, perfect fourth, perfect fifth, minor seventh, and the octave.
Recently some flute makers have begun experimenting with different scales, giving players new melodic options.
The pitch standard used by many Native American flutes before the mid-1980s was arbitrary.
However, contemporary Native American flutes are often tuned to a concert pitch standard
so that they can be easily played with other instruments.
The root keys of contemporary Native American flutes span a range of about three and a half octaves, from C2 to A5.Early recordings of Native American flutes are available from several sources.

Fingering
Native American flutes typically have either five or six finger holes, but any particular instrument may have from zero to seven finger holes. The instrument may include a finger hole covered by the thumb.
The fingerings for various pitches are not standardized across all Native American flutes. However,
many contemporary Native American flutes will play the primary scale using the fingering shown in the adjacent diagram.
While the pentatonic minor scale is the primary scale on most contemporary Native American flutes,
many flutes can play notes of the chromatic scale using cross-fingerings.

Tuning
Authentic Native American flutes and Native American 'Style' flutes are available in a wide variety of keys and musical temperaments—far more than typically available for other woodwind instruments.
Instruments tuned to equal temperament are typically available in all keys within the range of the instrument.
Instruments are also crafted in other musical temperaments, such as just intonation, and pitch standards, such as A4=432 Hz.

Warble
A distinctive sound of some Native American flutes, particularly traditional flutes, is called a  warble (or warbling).
It sounds as if the flute is vacillating back and forth between distinct pitches. However, it is actually the sound of different harmonic components of same sound coming into dominance at different times.John W. Coltman, in a detailed analysis of flute acoustics, describes two types of warbles in Native American flutes: One "of the order of 20 Hz" caused by a "nonlinearity in the jet current", and a second type "in which amplitude modulation occurs in all partials but with different phases". The first type is analyzed by Coltman in a controlled setting, but he concluded that analysis of the second type of warble "is yet to be explained".The warble can be approximated by use of vibrato techniques. The phase shift that occurs between different harmonics can be observed on a spectrograph of the sound of a warbling flute.

Written music
Written music for the Native American flutes is often in the key of F-sharp minor, although some music is scored in other keys. However, the convention for this music written in F-sharp minor is to use a non-conforming key signature of four sharps, creating what is known as "Nakai tablature".
Note that the use of finger diagrams below the notes that is part a high percentage of written music for the Native American flutes is not necessarily part of Nakai tablature.
The use of a standard key signature for written music that can be used across Native American flutes in a variety of keys classifies the instrument as a transposing instrument.

Music
Extensive ethnographic recordings were made by early anthropologists such as Alice Cunningham Fletcher,
Franz Boas,
Frank Speck,
Frances Densmore,
and Francis La Flesche.
A small portion of these recordings included Native American flute playing.
One catalog lists 110 ethnographic recordings made prior to 1930.These recordings document traditional flute styles in a number of different Indigenous cultures and settings.
However, the legal and ethical issues surrounding access to these early recordings are complex.
Because of incidents of misappropriation of ethnographic materials recorded within their 
territories, Indigenous communities today claim the right to determine whether, how and on what terms 
elements of their intangible cultural heritage are studied, recorded, re-used and 
represented by researchers, museums, commercial interests and others.During the period 1930–1960, few people were playing the Native American flute in public performances, or allowing recordings to be made. However, a few recordings of flute playing during this period are commercially available.
One such recording is by Belo Cozad, a Kiowa flute player who made recordings for the U. S. Library of Congress in 1941.

Revival
During the late 1960s, the United States saw a roots revival of the Native American flute, with a new wave of flutists and artisans such as Doc Tate Nevaquaya, John Rainer, Jr., Sky Walkinstik Man Alone, and Carl Running Deer.
The music of R. Carlos Nakai became popular in the 1980s,
in particular with the release of the album "Canyon Trilogy" in 1989.
His music was representative of a shift in style from a traditional approach to playing the instrument
to incorporate the New-age genre. Mary Youngblood won two Grammy Awards
in the Native American Music category for her Native American flute music
in 2002 and 2006. She remains the only Native American flutist to be distinguished in this way, as the National Academy of Recording Arts and Sciences retired the category in 2011.
Today, Native American flutes are being played and recognized by many different peoples and cultures around the world.

Community music
The Native American flute has inspired hundreds of informal community music groups which meet periodically to play music and further their interest in the instrument. These groups are known as flute circles.Several national organizations have formed to provide support to these local flute circles:

WFS — World Flute Society (U.S.A.)
FTF — FluteTree Foundation (U.S.A.) (formerly RNAFF, Renaissance of the North American Flute Foundation)
JIFCA — Japan Indian Flute Circle Association (日本インディアンフルートサークル協会) (Japan)

Popular appeal
The Native American flute has gained popularity among flute players, in large part because of its simplicity.
According to a thesis by Mary Jane Jones:: 56–57 
The flute's cathartic appeal probably lies in its simplicity. In their quest to build instruments that could play several chromatic octaves with perfect intonation, Europeans produced mechanically complex instruments that require a great deal of technical skill on the part of the musician. Until a high level of competence is achieved, pouring out one‘s innermost feelings during a performance is extremely difficult. The ability to play musically and emotionally is subject to the musician‘s technical ability. As most music teachers will attest, many beginners take so long to master the necessary skills and are so focused on the technical aspects of their instruments that they must eventually be taught how to play with feeling. Struggling with the demands of their instruments over time causes them to lose the emotional connection to music that they may have felt when singing as young children. Since beginners can play melodies on the Native American flute with ease, it is possible for them to play expressively from the outset. As flute players become better acquainted with their instruments, their improvisations tend to become longer, have more complex melodies and forms, and contain more embellishments. However, the ability to express emotion through improvisation on the flute seems as easy for the beginner as it is for the advanced student.

Flutists and composers
Notable and award-winning Native American flutists include: 
R. Carlos Nakai,
Charles Littleleaf,
Joseph Firecrow,
Kevin Locke,
Aaron White, Robert Mirabal and
Mary Youngblood.
A few classical composers have written for the Native American flute, including
Brent Michael Davids,
James DeMars,
Philip Glass,
Jerod Impichchaachaaha' Tate, and 
Fabio Mengozzi.

Legal issues
1990 Indian Arts and Crafts Act
The 1990 Indian Arts and Crafts Act of the United States criminalized deceptive product-labeling of goods that are ostensibly made by Native Americans.
In the United States, wrongfully claiming that an artifact is crafted by "an Indian" is a felony offense.
The US Department of the Interior explicitly states on its informational website about the Act that, "Under the Act, an Indian is defined as a member of any federally or
State recognized Indian Tribe, or an individual certified as an Indian artisan by an Indian Tribe."Based on this statute, only a flute fashioned by a person who qualifies as an Indian under the terms of the statute can legally be sold as a "Native American flute" or "American Indian flute".
However, although there is no official public ruling on alternative terms that are acceptable,
it is general practice that any manufacturer or vendor may legally label their work-product by other terms such as "Native American style flute" or "North American flute".
Labels such as "in the style of", or "in the spirit of", or "replica" may also be used.However, while the Act applies to offering handmade arts and crafts offered to the public for sale, it does not apply to the use of Native American flutes in situations such as performance, workshops, or recording.

Migratory Bird Treaty Act of 1918
The Migratory Bird Treaty Act of 1918 makes it unlawful (without a waiver) to use materials from species protected by the Act in a musical instrument.
This statute applies to the eagle-bone whistle, examples of which might or might not be classified as a Native American flute depending on the particulars of their construction.

Documentaries
Songkeepers (1999, 48 min.).  Directed by Bob Hercules.  Produced by Dan King.  Lake Forest, Illinois: America's Flute Productions.  Five distinguished traditional flute artists – Tom Mauchahty-Ware, Sonny Nevaquaya, R. Carlos Nakai, Hawk Littlejohn, Kevin Locke – talk about their instrument and their songs and the role of the flute and its music in their tribes.
Journey to Zion (2008, 44 min.). A documentary by Tim Romero. Santa Maria, California: Solutions Plus. An inspirational documentary about Native flute enthusiasts attending the Zion Canyon Art & Flute Festival located in Springdale, Utah, the gateway to Zion National Park.

See also
Bamboo musical instruments
Edge-blown aerophones

References
Global Music Awards

External links

Flutopedia — an Encyclopedia for the Native American Flute.
FluteCast videos
FluteTree Foundation
World Flute Society
Basic Music Theory for the Native American Flute
The Native Flute Handbook