The bassoon is a musical instrument in the woodwind family, which plays in the tenor and bass ranges. It is composed of six pieces, and is usually made of wood. It is known for its distinctive tone color, wide range, versatility, and virtuosity. It is a non-transposing instrument and typically its music is written in the bass and tenor clefs, and sometimes in the treble. There are two forms of modern bassoon: the Buffet (or French) and Heckel (or German) systems. It is typically played while sitting using a seat strap, but can be played while standing if the player has a harness to hold the instrument. Sound is produced by rolling both lips over the reed and blowing direct air pressure to cause the reed to vibrate. Its fingering system can be quite complex when compared to those of other instruments. Appearing in its modern form in the 19th century, the bassoon figures prominently in orchestral, concert band, and chamber music literature, and is occasionally heard in pop, rock, and jazz settings as well. One who plays a bassoon is called a bassoonist.
The word bassoon comes from French basson and from Italian bassone (basso with the augmentative suffix -one), both terms that refer to the version of any instrument in a bass register. The term for bassoon used in classical music scores and parts is often its Italian name fagotto (plural fagotti), which referred initially to the dulcian. This word, adopted in many other European languages as fagot, fagote, or in German, Fagott, comes from an Old French word meaning a bundle of sticks.
The range of the bassoon begins at B♭1 (the first one below the bass staff) and extends upward over three octaves, roughly to the G above the treble staff (G5). However, most writing for bassoon rarely calls for notes above C5. Stravinsky's opening solo in The Rite of Spring ascends to D5, and Ravel's Piano Concerto calls for E5, but notes this high are seldom written, as they are difficult to produce (often requiring specific reed design features to ensure reliability), and at any rate are quite homogeneous in timbre to the same pitches on the cor anglais, which can produce them with relative ease. French bassoon’s greater facility in the extreme high register means repertoire written for it is somewhat likelier to include very high notes, although modern players of German system can achieve these notes.
Mechanical improvements since its invention gradually expanded the high range of the bassoon. Increasing use of bassoon for tenor lines in the late Baroque saw tenor clef sometimes employed, partly to avoid excessive ledger lines, and by the 20th century treble clef was used as well.
Like other woodwind instruments, the lowest note is fixed, but A1 is possible with a special extension to the instrument—see "Extended techniques" below.
Although the mechanism is in F (effectively an octave beneath English horn) the bassoon is non-transposing, meaning that notes sounded match the written pitch, in the same manner as bass recorder.
The bassoon disassembles into six main pieces, including the reed. The bell (6), extending upward; the bass joint (or long joint) (5), connecting the bell and the boot; the boot (or butt) (4), at the bottom of the instrument and folding over on itself; the wing joint (or tenor joint) (3), which extends from boot to bocal; and the bocal (or crook) (2), a crooked metal tube that attaches the wing joint to a reed (1) ().
The bore of the bassoon is conical, like that of the oboe and the saxophone, and the two adjoining bores of the boot joint are connected at the bottom of the instrument with a U-shaped metal connector. Both bore and tone holes are precision-machined, and each instrument is finished by hand for proper tuning. The walls of the bassoon are thicker at various points along the bore; here, the tone holes are drilled at an angle to the axis of the bore, which reduces the distance between the holes on the exterior. This ensures coverage by the fingers of the average adult hand. Playing is facilitated by closing the distance between the widely spaced holes with a complex system of key work, which extends throughout nearly the entire length of the instrument. The overall height of the bassoon stretches to 1.34 m (4 ft 5 in) tall, but the total sounding length is 2.54 m (8 ft 4 in) considering that the tube is doubled back on itself. There are also short-reach bassoons made for the benefit of young or petite players.
A modern beginner's bassoon is generally made of maple, with medium-hardness types such as sycamore maple and sugar maple preferred. Less-expensive models are also made of materials such as polypropylene and ebonite, primarily for student and outdoor use. Metal bassoons were made in the past but have not been produced by any major manufacturer since 1889.
The art of reed-making has been practiced for several hundred years, some of the earliest known reeds having been made for the dulcian, a predecessor of the bassoon. Current methods of reed-making consist of a set of basic methods; however, individual bassoonists' playing styles vary greatly and thus require that reeds be customized to best suit their respective bassoonist. Advanced players usually make their own reeds to this end. With regards to commercially made reeds, many companies and individuals offer pre-made reeds for sale, but players often find that such reeds still require adjustments to suit their particular playing style.
Modern bassoon reeds, made of Arundo donax cane, are often made by the players themselves, although beginner bassoonists tend to buy their reeds from professional reed makers or use reeds made by their teachers. Reeds begin with a length of tube cane that is split into three or four pieces using a tool called a cane splitter. The cane is then trimmed and gouged to the desired thickness, leaving the bark attached. After soaking, the gouged cane is cut to the proper shape and milled to the desired thickness, or profiled, by removing material from the bark side. This can be done by hand with a file; more frequently it is done with a machine or tool designed for the purpose. After the profiled cane has soaked once again it is folded over in the middle. Prior to soaking, the reed maker will have lightly scored the bark with parallel lines with a knife; this ensures that the cane will assume a cylindrical shape during the forming stage.
On the bark portion, the reed maker binds on one, two, or three coils or loops of brass wire to aid in the final forming process. The exact placement of these loops can vary somewhat depending on the reed maker. The bound reed blank is then wrapped with thick cotton or linen thread to protect it, and a conical steel mandrel (which sometimes has been heated in a flame) is quickly inserted in between the blades. Using a special pair of pliers, the reed maker presses down the cane, making it conform to the shape of the mandrel. (The steam generated by the heated mandrel causes the cane to permanently assume the shape of the mandrel.) The upper portion of the cavity thus created is called the "throat", and its shape has an influence on the final playing characteristics of the reed. The lower, mostly cylindrical portion will be reamed out with a special tool called a reamer, allowing the reed to fit on the bocal.
After the reed has dried, the wires are tightened around the reed, which has shrunk after drying, or replaced completely. The lower part is sealed (a nitrocellulose-based cement such as Duco may be used) and then wrapped with thread to ensure both that no air leaks out through the bottom of the reed and that the reed maintains its shape. The wrapping itself is often sealed with Duco, beeswax, or clear nail varnish (polish). Electrical tape can also be used as a wrapping for amateur reed makers. The bulge in the wrapping is sometimes referred to as the "Turk's head"—it serves as a convenient handle when inserting the reed on the bocal. Alternatively, hot glue, epoxy, or heat shrink wrap may be used to seal the tube of the reed. The thread wrapping (commonly known as a "Turban" due to the criss-crossing fabric) is still more common in commercially sold reeds.