Flute, Oboe, Clarinet, Bassoon Registers: A Guide for Players, Listeners

Compared with any other major category of musical instruments, woodwinds have more markedly individual sound characteristics and more variations of tone color within each instrument's range.

A distinct portion of the total range of pitches that an instrument can play is called a register, as in lower register and upper register.

Being aware of, and alert to, the different colors, intensities, sustaining powers, and tonal weights of each woodwind instrument's different registers can help both players and listeners.

Players on the instrument itself can use such awareness to emphasize the unique qualities of register differences as a means of enhancing their technique and enriching their performance. Moreover, players who are aware of other instruments' register qualities can more effectively maintain a sense of ensemble balance.

Listeners can use such knowledge to differentiate instruments and to appreciate the origin and interplay of tonal colors.

A woodwind player produces tones by using breath to set up vibrations at the instrument's embouchure, through which the vibrations are transmitted to the instrument's air column, where the tones are generated.

The four principal representatives of orchestral woodwinds are the flute, oboe, clarinet, and bassoon. The flute's embouchure is a side hole, across which the player blows air. The oboe and bassoon embouchure is a double reed (smaller for the oboe, larger for the bassoon), which is inserted into the player's mouth. The clarinet embouchure is a single-reed mouthpiece, which is inserted into the player's mouth.

Flute
The flute has a three-octave range, beginning at middle C. Each octave may be viewed as a register.

Tones in the lowest half-octave have a sound like no other in music: dark and heavy, but warm and mellifluous. The next half-octave gradually brightens.

In the middle octave, or register, flute tones are at their most characteristic: clear and bright.

The third octave is brilliant. Tones have great carrying power and can be piercing without being shrill up to the highest A or B-flat.

Rapid leaps back and forth between registers are common for the flute, which is the most agile of wind instruments.

Oboe
The effective oboe range is two octaves and a major sixth, beginning at the B-flat just below middle C. Broadly speaking, it has three registers.

The lowest tone, B-flat, is seldom called for because it requires such a forceful attack to play it. The other low tones, up to about E on the first line of the treble staff, tend to be raspy and loud, but those qualities can be mitigated by a skilled player.

The middle register, up to about G above the staff, is the most characteristic part of the oboe's range: nasal and penetrating, yet warm. The oboe is often called on as a solo instrument in its middle register because of its unique tone color and expressiveness.

Higher tones have more bite. From A to D, the oboe tone becomes thinner. Above D, the tones lose much of the characteristic oboe sound but can produce a brilliant effect up to G.

Clarinet
The most common form of clarinet is the B-flat clarinet, which is a transposing instrument, notated a whole tone higher than the actual sound. It has a range of three octaves and a minor sixth, beginning on the written E on the fourth space below the treble staff. The clarinet has the richest variety of tone colors among all the wind instruments, with five distinct registers.

Chalumeau. This is the lowest register, from low E up to F-sharp on the first space of the staff. The register is named after one of the clarinet's ancestors. The dark, rich tone color is unique not only on the clarinet but in the whole orchestra, almost as if composers had a completely separate instrument available.

Throat register or throat tones. These four tones are the open tone G (no hole or key touched), G-sharp, A, and B-flat. Compared with other clarinet tones, these four have less weight and vibrancy. The reason for this difference in quality is that these tones are performed with the sounding tube at its shortest lengths; therefore, the characteristic tone quality of the instrument is lessened. The throat tones can be very effective as dramatic musical contrasts to other clarinet tones and as tools for tone painting appropriate moods.

The break. This is not a register but an often-discussed passage from one register to another. It consists of the move from B-flat to B-natural. B-flat is played with the entire tube open, while B-natural is played with the entire tube closed (except for a vent hole).

This move is a "break" in two senses. First, its abrupt change of fingering is a "break" in the fingering process (awkward to perform for inexperienced players but not for experienced ones). Second, its abrupt change from a thin throat tone to a rich tone in the next register is a "break" in tone quality.

Clarino or clarion. This register ranges from B-natural up to the first C above the staff. Here the tones are strong, clear, bright, warm, and expressive.

High register. The tones from C-sharp to G constitute another clearly recognizable clarinet tone quality: brilliant and piercing in loud passages, and suggestive of a rich flutelike sound in soft passages.

Extreme register. From high G-sharp to C, clarinet tones are shrill. They are seldom called for except for special effects in loud passages.

Like the flute, the clarinet is capable of rapid shifts between registers. Throughout all its registers, the clarinet has a wider range of dynamic capabilities than any other woodwind instrument.

Bassoon
The effective range of the bassoon is three octaves and a major third (some players can go a little higher), beginning on B-flat below the bass staff. Compared with the flute, oboe, and clarinet, the bassoon is much more homogeneous in tone color throughout its range.

Tones in the low register are rich and sonorous. The characteristic roughness of double reeds is most noticeable here.

In the middle register, sometimes called the baritone register, tones are smoother. Here the bassoon is capable of great expressiveness, especially in its upper portion, from F-sharp on the fourth line of the bass staff up to the D just above middle C.

The high register, from the aforementioned D up an octave, has a tense, sharp-edged sound. Sustained passages in the high register are usually written on the tenor clef.
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The New Grove Dictionary of Music and Musicians. 2nd ed. London: Macmillan, 2001.