Western concert flute

Development

Boehm flute

In the nineteenth century, the great flautist, composer, acoustician, and silversmith Theobald Boehm began to make flutes. Keys were added to the flute, and the taper was changed to strengthen its lower register. The dimensions and key system of the modern western concert flute and its close relatives are strongly influenced by Boehm's design, which he patented in 1847. Minor additions to and variations on his key system are common, but the acoustical structure of the tube remains almost exactly as he designed it. Major innovations were the change from wood to metal, a large straight bore, a "parabolic" tapered headjoint bore, very large tone holes covered by keys, and the linked key system, which simplified fingering. The most substantial departures from Boehm's original description are the universal elimination of the "crutch" for the left hand and almost universal adoption of Briccialdi's thumb key mechanism and a closed-standing G♯ key over an additional G♯ tone hole. Boehm's key system, with minor variations, remains regarded as the most effective system of any modern woodwind, allowing trained instrumentalists to perform with facility in all keys. The modern flute has three octaves plus C₇–C♯₇–D₇ in the fourth octave. Many modern composers used the high D♯₇. While such extremes are not common, the modern flute can produce even higher notes.

19th-century variants

The Meyer flute was a popular flute in the mid 19th century. Including and derived from the instruments built by H.F. Meyer from 1850 to the late 1890s, it could have up to 12 keys and was built with head joints of either metal-lined ivory or wood. The final form was a combination of a traditional keyed flute and the Viennese flute, and became the most common throughout Europe and America. This form had 12 keys, a body of wood, a head joint of metal and ivory, and was common at the end of the century.

Quite at the opposite end of the spectrum, in terms of the complexity of the key system developed by Boehm, was the Giorgi flute, an advanced form of the ancient holed flute. Patented in 1897, the Giorgi flute was designed without any mechanical keys, though the patent allows for the addition of keys as options. Giorgi enabled the performer to play equally true in all musical keys, as does the Boehm system. Giorgi flutes are now rarities, found in museums and private collections. The underlying principles of both flute patterns are virtually identical, with tone holes spaced as required to produce a fully chromatic scale. The player, by opening and closing holes, adjusts the effective length of the tube, and thus the rate of oscillation, which defines the audible pitch.

Modified Boehm flute

In the 1950s, Albert Cooper modified the Boehm flute to make playing modern music easier. The flute was tuned to A440, and the embouchure hole was cut in a new way to change the timbre. These flutes became the most used flutes by professionals and amateurs.

In the 1980s, Johan Brögger modified the Boehm flute by fixing two major problems that had existed for nearly 150 years: maladjustment between certain keys and problems between the G and B♭ keys. The result was non-rotating shafts, which gave a quieter sound and less friction on moving parts. Also, the modifications allowed for springs to be adjusted individually, and the flute was strengthened. The Brögger flute is only made by the Brannen Brothers and Miyazawa Flutes.

Characteristics

The flute is a transverse (or side-blown) woodwind instrument that is closed at the blown end. It is played by blowing a stream of air over the embouchure hole. The pitch is changed by opening or closing keys that cover circular tone holes (there are typically 16 tone holes). Opening and closing the holes produces higher and lower pitches. Higher pitches can also be achieved through over-blowing, like most other woodwind instruments. The direction and intensity of the airstream also affects the pitch, timbre, and dynamics.

The piccolo is also commonly used in Western orchestras and bands. Alto flutes, pitched a fourth below the standard flute, and bass flutes, an octave below, are also used occasionally.

(B₃) C₄–C₇ (F♯₇)

The standard concert flute, also called C flute, Boehm flute, silver flute, or simply flute, is pitched in C and has a potential range of three and a half octaves starting from the note C₄ (middle C). The flute's highest pitch is usually given as C₇ or (in more modern flute literature) D₇. More experienced flautists are able to reach up to F♯₇, but notes above D₇ are difficult to produce. Modern flutes may have a longer foot joint, a B-footjoint, with an extra key to reach B₃.

From high to low, the members of the concert flute family include the following:

• Piccolo in C or D♭
• Treble flute in G
• Soprano flute in E♭
• Concert flute in C, described above
• Flûte d'amour (also called tenor flute) in B♭, A, or A♭
• Alto flute in G
• Bass flute in C
• Contra-alto flute in G
• Contrabass flute in C (also called octobass flute)
• Subcontrabass flute in G (also called double contra-alto flute) or C (also called double contrabass flute)
• Double contrabass flute in C (also called octocontrabass flute or subcontrabass flute)
• Hyperbass flute in C

Each of the above instruments has its own range. The piccolo reads music in C (like the standard flute), but sounds one octave higher. The alto flute is in the key of G, and the low register extends to the G below middle C; its highest note is a high G (4 ledger lines above the treble staff). The bass flute is an octave lower than the concert flute, and the contrabass flute is an octave lower than the bass flute.

Less commonly seen flutes include the treble flute in G, pitched one octave higher than the alto flute; soprano flute, between the treble and concert; and tenor flute or flûte d'amour in B♭, A or A♭ pitched between the concert and alto.

Flutes pitched lower than the bass flute were developed in the 20th century. These include the contra-alto flute (pitched in G, one octave below the alto), the subcontrabass flute (pitched in G, two octaves below the alto), and the double contrabass flute (pitched in C, one octave below the contrabass). The flute sizes other than the concert flute and piccolo are sometimes called harmony flutes.

Construction and materials

Concert flutes have three parts: the headjoint, body, and foot joint. The headjoint is sealed by a cork (or plug that may be made out of various plastics, metals, or less commonly woods). It is possible to make fine adjustments to tuning by adjusting the headjoint cork, but usually it is left in the factory-recommended position around 17.3 mm (0.68 in) from the centre of the embouchure hole for best scale. Gross, temporary adjustments of pitch are made by moving the headjoint in and out of the headjoint tenon. The flautist makes fine or rapid adjustments of pitch and timbre by adjusting the embouchure and/or position of the flute in relation to himself or herself, i.e., side and out.

• Crown – the cap at the end of the head joint that unscrews to expose the cork and helps keep the head joint cork positioned at the proper depth.
• Lip plate – the part of the head joint that contacts the player's lower lip, allowing positioning and direction of the air stream.
• Riser – the metal section that raises the lip plate from the head joint tube.
• Head joint – the top section of the flute, it has the tone hole/lip plate where the player initiates the sound by blowing air across the opening.
• Body – the middle section of the flute with the majority of the keys.
• Closed-hole – a fully covered finger key.
• Open-hole – a finger key with a perforated center.
• Pointed arms – arms connecting the keys to the rods, which are pointed and extend to the keys' centers. These are found on more expensive flutes.
• French model – a flute with pointed French-style arms and open-hole keys, as distinguished from the plateau style with closed holes.
• Inline G – the standard position of the left-hand G (third-finger) key – in line with the first and second keys.
• Offset G – a G key extended to the side of the other two left-hand finger keys (along with the G♯ key), making it easier to reach and cover effectively.
• Split E mechanism – a system whereby the second G key (positioned below the G♯ key) is closed when the right middle-finger key is depressed, enabling a clearer third octave E; omitted from many intermediate- and professional flutes, as it can reduce the tonal quality of the third-octave F♯ (F♯₆).
• Trill keys – two small teardrop shaped keys between the right-hand keys on the body; the first enables an easy C–D trill, and the second enables C–D♯. A–B♭ lever or "trill" key is located in line directly above the right first-finger key. An optional C♯ trill key that facilitates the trill from B to C♯ is sometimes found on intermediate- and professional flutes. The two trill keys are also used in playing the high B♭ and B.
• Foot joint – the last section of the flute (played farthest towards the right).
• C foot – a foot joint with a lowest note of middle C (C₄); typical on student flutes.
• B foot – a foot joint with a lowest note of B below middle C (B₃), which is an option for intermediate and professional flutes.
• D♯ roller – an optional feature added to the E♭ key on the foot joint, facilitating the transition between E♭/D♯ and D♭/C♯, and C.
• "Gizmo key" – an optional key on the B foot joint that helps play C₇.

Head joint shape

The head-joint tube is tapered slightly towards the closed end. Theobald Boehm described the shape of the taper as parabolic. Examination of his flutes did not reveal a true parabolic curve, but the taper is more complex than a truncated cone. The head joint is the most difficult part to construct because the lip plate and tone hole have critical dimensions, edges, and angles that vary slightly between manufacturers and in individual flutes, especially where they are handmade.

Head joint geometry appears particularly critical to acoustic performance and tone, but there is no clear consensus on a particular shape amongst manufacturers. Acoustic impedance of the embouchure hole appears to be the most critical parameter. Critical variables affecting this acoustic impedance include: chimney length (the hole between lip-plate and head tube), chimney diameter, and radiuses or curvature of the ends of the chimney. Generally, the shorter the hole, the more quickly a flute can be played; the longer the hole, the more complex the tone. Finding a particularly good example of a flute is dependent on play-testing. Head joint upgrades are usually suggested as a way to improve the tone of an instrument.

Cheaper student models may be purchased with a curved head to allow younger children with shorter arms to play them.

Tubing materials

Less expensive flutes are usually constructed of brass, polished and then silver-plated and lacquered to prevent corrosion, or silver-plated nickel silver (nickel-bronze bell metal, 63% Cu, 29% Zn, 5.5% Ni, 1.25% Ag, .75% Pb, alloyed As, Sb, Fe, Sn). Flutes that are more expensive are usually made of more precious metals, most commonly solid sterling silver (92.5% silver), and other alloys including French silver (95% silver, 5% copper), "coin silver" (90% silver), or Britannia silver (95.8% silver). It is reported that old Louis Lot French flutes have a particular sound by nature of their specific silver alloy. Gold/silver flutes are even more expensive. They can be either gold on the inside and silver on the outside, or vice versa. All-gold and all-platinum flutes also exist. Flutes can also be made out of wood, with African blackwood (grenadilla or Dalbergia melanoxylon) being the most common today. Cocuswood was formerly used, but this is hard to obtain today. Wooden flutes were far more common before the early 20th century. The silver flute was introduced by Boehm in 1847, but did not become common until later in the 20th century. William S. Haynes, a flute manufacturer in Boston, Massachusetts, United States, told Georges Barrère that in 1905 he made one silver flute to every 100 wooden flutes, but in the 1930s, he made one wooden flute to every 100 silver flutes.

Unusual tubing materials include glass, carbon fiber, and palladium.

Opinions on how different materials affect sound quality vary widely. Flute maker Verne Q. Powell stated that "As far as tone is concerned, I contend that 90 percent of it is the man behind the flute".

Most metal flutes are made of alloys that contain significant amounts of copper or silver. These alloys are biostatic because of the oligodynamic effect and thus suppress growth of unpleasant molds, fungi, and bacteria.

Good quality flutes are designed to prevent or reduce galvanic corrosion between the tube and key mechanism.

Pad materials

Tone holes are stopped by pads constructed of "fish skin" (goldbeater's skin) over felt, or sometimes silicone rubber on some low-cost or "ruggedized" flutes. Accurate shimming of pads on professional flutes to ensure pad sealing is very time consuming. In the traditional method, pads are seated on paper shims sealed with shellac. A recent development is "precision" pads fitted by a factory-trained technician. Student flutes are more likely to have pads bedded in thicker materials like wax or hot-melt glue. Larger-sized closed-hole pads are also held in with screws and washers.

Keywork

The keys can be made of the same or different metals as the tubing, nickel silver keys with silver tubing, for example. Flute key axles (or "steels") are typically made of drill rod or stainless steel. These mechanisms need periodic disassembly, cleaning, and relubrication, typically performed by a trained technician, for optimal performance. James Phelan, a flute maker and engineer, recommends single-weight motor oil (SAE 20 or 30) as a key lubricant demonstrating superior performance and reduced wear, in preference to commercial key oils).

The keywork is constructed by lost-wax castings and machining, with mounting posts and ribs silver-soldered to the tube. On the best flutes, the castings are forged to increase their strength.

Most keys have needle springs made of phosphor bronze, stainless steel, beryllium copper, or a gold alloy. The B thumb keys typically have flat springs. Phosphor bronze is by far the most common material for needle springs because it is relatively inexpensive, makes a good spring, and is resistant to corrosion. Unfortunately, it is prone to metal fatigue. Stainless steel also makes a good spring and is resistant to corrosion. Gold springs are found mostly in high-end flutes because of gold's cost.

Mechanical options

B♭ thumb key

The B♭ thumb key (invented and pioneered by Briccialdi) is considered standard today.

Open hole keys versus plateau keys

Open-hole "French model" flutes have circular holes in the centers of five of the keys. These holes are covered by the fingertips when the keys are depressed. Open-hole flutes are frequently chosen by concert-level flautists, although this preference is less prevalent in Germany, Italy, and Eastern Europe. Students may use temporary plugs to cover the holes until they can reliably cover the holes with the fingertips. Some flautists claim that open-hole keys permit louder and clearer sound projection in the lower register. Open-hole keys are needed for ethnic styles such as traditional Celtic music, and for some modern concert pieces that require harmonic overtones or "breathy" sounds. They can also facilitate alternate fingerings, extended techniques such as quarter-tones, glissandi, and multiphonics. Closed holes (plateau keys) permit a more relaxed hand position for some flautists.

Offset G versus in-line G keys

All of Boehm's original models had offset G keys, which are mechanically simpler, and permit a more relaxed hand position, especially for flautists with small hands. Some players prefer the hand position of the in-line G. For many years there was a misperception that inline G was for "professional" flutes while offset G was for "student" models, but this stereotype has been largely debunked.

Split E

The split E modification makes the third octave E (E₆) easier to play for some flautists. A less expensive option is the "low G insert".

B foot

The B foot extends the range of the flute down one semitone to B₃ (the B below middle C).

Gizmo key

Some flutes with a B foot have a "gizmo key": a device that allows closure of the B tone hole independently of the C and C♯ keys. The gizmo key makes C₇ easier to play.

Trill keys

The three standard trill keys permit rapid alternation between two notes with disparate standard fingerings: lowest, middle, and highest trill keys ease C–D♯, C–D, and B♭–A, respectively. Some higher notes (third-octave B and B♭ and most fourth-octave notes) also require use of the two lower trill keys. A fourth so-called C♯ trill key is an increasingly popular option available on many flutes. It is named after one of its uses, to ease the B to C♯ trill, but it also allows some trills and tremolos that are otherwise very difficult, such as high G to high A. Another way of trilling G₆–A₆ is a dedicated high G–A trill key.

D♯ roller

Some models offer a D♯ roller option, or even an optional pair of parallel rollers on the D♯ and C♯ keys, that ease motion of the right little finger on, for example, low C to D♯.

Soldered tone holes

Tone-holes may be either drawn (by pulling the tube material outwards) or soldered (cutting a hole in the tube and soldering an extra ring of material on). Soldered tone-holes are thought by some to improve tone, but generally cost more.

Scale and pitch

The standard pitch has varied widely over history, and this has affected how flutes are made. Although the standard concert pitch today is A₄ = 440 Hz, many manufacturers optimize the tone hole size/spacings for higher pitch options such as A₄ = 442 Hz or A₄ = 444 Hz. (As noted above, adjustments to the pitch of one note, usually the A₄ fingering, can be made by moving the headjoint in and out of the headjoint tenon, but the point here is that the mechanical relationship of A₄ to all other pitches is set when the tone holes are cut. However, small deviations from the objective 'mechanical' pitch (which is related to acoustic impedance of a given fingering) can be improvised by embouchure adjustments.)

Composition

Classical music

An early version of Antonio Vivaldi's La tempesta di mare flute concerto was possibly written around 1713–1716, and would thus have been the first concerto for the instrument, as well as the earliest scoring of a high F₆, a problematic note for the Baroque flute of that period.

Pop, jazz, and rock

Flutes were rarely used in early jazz. Drummer and bandleader Chick Webb was among the first to use flutes in jazz, beginning in the late 1930s. Frank Wess was among the first noteworthy flautists in jazz, in the 1940s. Since Theobald Boehm's fingering is used in saxophones as well as in concert flutes, many flute players "double" on saxophone for jazz and small ensembles and vice versa.

Since 1950, a number of notable performers have used flutes in jazz. Frank Foster and Frank Wess (Basie band), Jerome Richardson (Jones/Lewis big band) and Lew Tabackin (Akiyoshi/Tabackin big band) used flutes in big band contexts. In small band contexts, notable performers included Bud Shank, Herbie Mann, Yusef Lateef, Mélanie De Biasio, Joe Farrell, Rahsaan Roland Kirk, Charles Lloyd, Hubert Laws and Moe Koffman. Several modal jazz and avant-garde jazz performers have used the flute, including Eric Dolphy, Sam Rivers, and James Spaulding.

Jethro Tull is probably the best-known rock group to make regular use of the flute, which is played by its frontman, Ian Anderson. An alto flute is briefly heard in The Beatles song "You've Got to Hide Your Love Away", played by John Scott. The Beatles would later feature a flute more prominently in their single "Penny Lane".

Other groups that have used the flute in pop and rock songs include The Moody Blues, Chicago, Australian groups Men at Work and King Gizzard & the Lizard Wizard, the Canadian progressive rock group Harmonium, Dutch bands Focus and early Golden Earring, and the British groups Traffic, Genesis, Gong (although its flautist/saxophonist Didier Malherbe was French), Hawkwind, King Crimson, Camel, and Van der Graaf Generator.

American singer Lizzo is also known for playing the flute. Her instrument is named Sasha Flute, which has its own Instagram account.