Lute can refer generally to any plucked string instrument with a neck (either fretted or unfretted) and a deep round back, or more specifically to an instrument from the family of European lutes.
The European lute and the modern Near-Eastern oud both descend from a common ancestor via diverging evolutionary paths. The lute is used in a great variety of instrumental music from the early Renaissance to the late Baroque eras. It is also an accompanying instrument, especially in vocal works, often realizing a basso continuo or playing a written-out accompaniment.
The player of a lute is called a lutenist, lutanist, or lutist, and a maker of lutes (or any string instrument) is referred to as a luthier.
Etymology
The words "lute" and "oud" derive from Arabic al‘ud (العود; literally "the wood").[1] Recent research by Eckhard Neubauer suggests that ‘ud may in turn be an Arabized version of the Persian name rud, which meant "string," "stringed instrument," or "lute."[2] Gianfranco Lotti suggests that the "wood" appellation originally carried derogatory connotations, because of proscriptions of all instrumental music in early Islam.
Construction
Soundboard
Lutes are made almost entirely of wood. The soundboard is a teardrop-shaped thin flat plate of resonant wood (usually spruce). In all lutes the soundboard has a single (sometimes triple) decorated sound hole under the strings called the rose. The sound hole is not open, but rather covered with a grille in the form of an intertwining vine or a decorative knot, carved directly out of the wood of the soundboard.
Back
The back or the shell is assembled from thin strips of hardwood (maple, cherry, ebony, rosewood, gran, wood and/or other tonewoods) called ribs, joined (with glue) edge to edge to form a deep rounded body for the instrument. There are braces inside on the soundboard to give it strength; see the photo among the external links below.
Neck
The neck is made of light wood, with a veneer of hardwood (usually ebony) to provide durability for the fretboard beneath the strings. Unlike most modern stringed instruments, the lute's fretboard is mounted flush with the top. The pegbox for lutes before the Baroque era was angled back from the neck at almost 90° (see image), presumably to help hold the low-tension strings firmly against the nut, which is not traditionally glued in place, but is held in place by string pressure only. The tuning pegs are simple pegs of hardwood, somewhat tapered, that are held in place by friction in holes drilled through the pegbox. As with other instruments using friction pegs, the choice of wood used to make pegs is crucial. As the wood suffers dimensional changes through age and loss of humidity, it must as closely as possible retain a circular cross-section in order to function properly, as there are no gears or other mechanical aids for tuning the instrument. Often pegs were made from suitable fruitwoods such as European pearwood, or equally dimensionally stable analogues. Matheson, ca 1720, stated if a lute-player has lived eighty years, he has surely spent sixty years tuning.
Belly
The geometry of the lute belly is relatively complex, involving a system of barring in which braces are placed perpendicular to the strings at specific lengths along the overall length of the belly, the ends of which are angled quite precisely to abut the ribs on either side for structural reasons. Robert Lundberg, in his book "Historical Lute Construction," suggests that ancient builders placed bars according to whole-number ratios of the scale length and belly length. He further suggests that the inward bend of the soundboard (the 'belly scoop') is a deliberate adaptation by ancient builders to afford the lutenist's right hand a bit more space between the strings and soundboard. The belly thickness is somewhat variable, but hovers between 1.5 and 2 millimeters in general. Some luthiers tune the belly as they build, removing mass and adapting bracing to ensure proper sonic results. The lute belly is almost never finished, though in some cases the luthier may size the top with a very thin coat of shellac or glair in order to help keep it clean. The belly is joined directly to the rib, without a lining glued to the sides, although a cap and counter cap are glued to the inside and outside of the bottom end of the bowl to provide rigidity and increased gluing surface.
After joining the top to the sides, a half binding is usually installed around the edge of the belly. The half-binding is approximately half the thickness of the belly and is usually made of a contrasting color wood. The rebate for the half-binding must be extremely precise to avoid compromising structural integrity.
Bridge
The bridge, usually made of a fruitwood, is attached to the soundboard usually at 1/5 to 1/7 the belly length. It does not have a separate saddle but has holes bored into it to which the strings attach directly. Typically the bridge is made such that it tapers in height and length, with the small end holding the trebles and the higher and wider end carrying the basses. Bridges are often colored black with carbon black in a binder, often shellac, and often have inscribed decoration. The scrolls or other decoration on the ends of lute bridges are usually integral to the bridge, and are not added afterwards as on some Renaissance guitars (cf Joachim Tielke's guitars).
Frets
The frets are made of loops of gut tied around the neck. They fray with use, and must be replaced from time to time. A few additional partial frets of wood are usually glued to the body of the instrument, to allow stopping the highest-pitched courses up to a full octave higher than the open string, though these are anachronistic and do not appear on original instruments. Given the choice between nylon and gut, many luthiers prefer to use gut, as it conforms more readily to the sharp angle at the edge of the fingerboard.
Strings
Strings were historically made of animal gut, usually from the small intestine of sheep (sometimes in combination with metal) and are still made of gut or a synthetic substitute, with metal windings on the lower-pitched strings. Modern manufacturers make both gut and nylon strings, and both are in common use. Gut is more authentic for playing period pieces, though unfortunately it is also more susceptible to irregularity and pitch instability due to changes in humidity. Nylon offers greater tuning stability but is seen as anachronistic by purists, as its timbre differs from the sound of earlier gut strings. Such concerns are moot when more recent compositions for the lute are performed.
Of note are the "catlines" used as basses on historical instruments. Catlines are several gut strings wound together and soaked in heavy metal solutions which increase the mass of the strings. Catlines can be quite large in diameter by comparison with wound nylon strings for the same pitch. They produce a bass which differs somewhat in timbre from nylon basses.
The lute's strings are arranged in courses, usually of two strings each, though the highest-pitched course usually consists of only a single string, called the chanterelle. In later Baroque lutes 2 upper courses are single. The courses are numbered sequentially, counting from the highest pitched, so that the chanterelle is the first course, the next pair of strings is the second course, etc. Thus an 8-course Renaissance lute will usually have 15 strings, and a 13-course Baroque lute will have 24.
The courses are tuned in unison for high and intermediate pitches, but for lower pitches one of the two strings is tuned an octave higher. (The course at which this split starts changed over the history of the lute.) The two strings of a course are virtually always stopped and plucked together, as if a single string, but in extremely rare cases a piece calls for the two strings of a course to be stopped and/or plucked separately. The tuning of a lute is a somewhat complicated issue, and is described in a separate section of its own, below. The result of the lute's design is an instrument extremely light for its size.
