flute

flute, wind instrument in which sound is produced by directing a stream of air against a sharp edge, causing the air to split and create vibrations within the enclosed air column. This process, known as edge-tone generation, produces a clear, sustained pitch without the use of reeds.

Types of flutes

In vertical, end-blown flutes—such as the Balkan kaval, the Arabic nāy, and the panpipes—the player directs the breath across the rim of the tube. In China, South America, Africa, and elsewhere, a notch may be cut in the edge to facilitate sound generation (notched flutes). In some regions, including China, South America, and Africa, a notch is cut into the edge to aid sound production (notched flutes), while nose-blown flutes, found particularly in Oceania, use airflow from the nasal cavity.

In transverse, or side-blown, flutes, the player blows across a lateral embouchure hole, directing the air stream against its far edge. Fipple flutes, such as the recorder, employ an internal duct to guide air against the edge, simplifying sound production. Flutes are typically tubular but may also be globular, as in the ocarina. Acoustically, a closed (stopped) flute produces a pitch approximately one octave lower than an open flute of comparable length.

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Historical developments

The flute is among the oldest known musical instruments. The earliest example of a Western end-blown flute was discovered in 2008 at Hohle Fels cave near Ulm, Ger. The flute, made from the bone of a griffin vulture, has five finger holes and measures about 8.5 inches (22 cm) long. It is thought to be at least 35,000 years old. Discoveries elsewhere in southwestern Germany yielded other flutes thought to be of similar age.

The characteristic flute of Western music is the transverse flute held sideways to the right of the player. It was known in ancient Greece and Etruria by the 2nd century bce and was next recorded in India, then China and Japan, where it remains a leading wind instrument. In the 16th century the tenor flute, pitched in G, was played in consort with descant and bass flutes (pitched in D and C respectively). All were typically of boxwood with six finger holes and no keys, semitones being made by cross-fingering (uncovering the holes out of sequence), and retained the cylindrical bore of their Asiatic bamboo relatives.

The flutes of the 16th century were made obsolete late in the 17th century by the development of the one-keyed conical flute, probably conceived by the celebrated Hotteterre family of makers and players in Paris. A conical flute is made in separate joints, the head joint being cylindrical, the others contracting toward the foot. Two joints were common in the 18th century, the upper being supplied in alternate lengths for tuning purposes. The instrument was known then as the flauto traverso, traversa, or German flute, as distinct from the common flute, usually called the recorder.

From 1760, in order to improve various semitones, three chromatic keys in addition to the original E♭ key began to be used. By 1800 the typical orchestral flute had these keys plus a lengthened foot joint to C, making six keys altogether. Two more keys produced the eight-keyed flute, which preceded the modern instrument and which lasted, with various auxiliary keys, in some German orchestras into the 20th century.

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Theobald Boehm, a Munich flute player and inventor, set out to rationalize the instrument, creating his new conical model in 1832. He replaced the traditional hole layout with an acoustically based one and improved the venting by replacing closed chromatic keys with open-standing keys, devising for their manipulation a system of ring keys on longitudinal axles (rings allow a player to close an out-of-reach key in the same motion as covering a finger hole).

This flute was superseded in 1847 by Boehm’s second design, with its experimentally evolved cylindrical bore (having a contracting or parabolic head)—the flute since used. The loss of a certain depth and intimacy of tone of the old conical flute has been offset by gains in evenness of notes, complete expressive control throughout the compass at all dynamic levels, and almost limitless technical flexibility.

The modern flute

The Boehm system remains the foundation of modern flute design. Such flutes (pitched in C with the range c′–c‴) are typically constructed of metal (such as silver, gold, or alloys), though wooden instruments are still used in certain contexts. It is 26.5 inches (67 cm) long, with a bore of about 0.75 inch, built in three sections: the head joint, the body (or middle joint), and the foot joint. The body and the foot joint (sometimes made in one piece) have the note holes (13 at least), which are controlled by an interlocking mechanism of padded key plates hinged on a longitudinal axis. The bore narrows in the head joint, which contains the mouth hole, and is closed just above the hole by a cork or fiber stopper; it is open at the foot end.

Related instruments in the flute family include the piccolo (higher-pitched), alto flute (in G), bass flute (an octave below a standard C flute), and contrabass flute (two octaves below a standard bass flute). These diverse instruments extend the range and tonal possibilities of the flute. In the modern era, the flute remains widely used in orchestral, chamber, solo, and global musical traditions, valued for its clarity, flexibility, and expressive range.