Typical Turkish kanun with a special 79-tone tuning mandal configuration by Ozan Yarman
The kanun, ganoun or kanoon (Arabic: ?, translit. q?n?n;Greek: , translit. kanonaki; Hebrew: ?, qanon; Persian: ??, q?n?n; Turkish: kanun; Armenian: , translit. k'anon; Azerbaijani: qanun; Uyghur: ?, ULY: qalon) is a string instrument played either solo, or more often as part of an ensemble, in much of the Middle East, Maghreb, West Africa, Central Asia, and southeastern regions of Europe. The name derives from the Arabic word qanun, meaning "rule, law, norm, principle", which is borrowed from the ancient Greek word and musical instrument (rule), which in Latin was called canon (not to be confused with the European polyphonic musical style and composition technique known by the same name). Traditional and Classical musics executed on the qanun are based on Maqamat or Makamlar. As the historical relative of santur from the same geography, qanun is thought to trace its origins back to Assyria, where an ancestral homologue might have been used in Mesopotamian royal courts and religious ceremonies. The instrument today is a type of large zither with a thin trapezoidal soundboard that is famous for its unique melodramatic sound.
Arabic qanuns are usually constructed with five skin insets that support a single long bridge resting on five arching pillars, whereas the somewhat smaller Turkish qanuns are based on just four. This allows Arabic variants of the instrument to have more room for the installation of extreme bass and treble strings. Kanuns manufactured in Turkey generally feature 26 courses of strings, with three strings per course in the case of all regional variants. Contemporary Levantine designs use Nylon or PVC strings that are stretched over the bridge poised on fish-skins as described on one end, and attached to wooden tuning pegs at the other end.
Ornamental sound holes called kafes are a critical component of what constitutes the accustomed timbre of qanun. However, they normally occupy different locations on the soundboard of Turkish kanuns compared to Arabic qanuns, and may also vary in shape, size and number depending on geography or personal taste.
The dimensions of a Turkish kanun are typically 95 to 100 cm (37-39") in length, 38 to 40 cm (15-16") in width, and 4 to 6 cm (1.5-2.3") in height. In contrast, an Arabic qanun measures a bit larger as mentioned.
Qanun is played on the lap while sitting or squatting, or sometimes on trestle support, by plucking the strings with two tortoise-shell picks (one for each hand) or with fingernails, and has a standard range of three and a half octaves from A2 to E6 that can be extended down to F2 and up to G6 in the case of Arabic designs.
The instrument also features special metallic levers or latches under each course called mandals. These small levers, which can be raised or lowered quickly by the performer while the instrument is being played, serve to slightly change the pitch of a particular course by altering effective string lengths.
On the regular diatonically tuned qanun, mandal technology was first implemented, according to Turkish musicologist Rauf Yekta, some 30 years prior to his submission of his invited monograph on Turkish Music to the 1922 edition of Albert Lavignac's Encyclopédie de la Musique et Dictionnaire du Conservatoire. Levantine qanuns, prior to that time, remained rather inflexible and cumbersome to perform on (especially as demanding modulations/transpositions came into vogue that were increasingly emulating Western tonality and key changes), requiring the player to use the fingernail of the thumb to depress on the leftmost ends of the courses to achieve on-the-fly intervallic alterations.
With the advent of electronic tuners some decades later, standardization of the placement of reference mandals on the qanun began. While Armenian kanuns now employ only equidistant half-tones and Arabic qanuns exact quarter-tones as a result, Turkish kanun-makers went so far as dividing the electroacoustically referenced equal-tempered semitone of 100 cents into 6 equal parts, yielding - for all intents and purposes - 72 equal divisions (or commas) of the octave pitch resolution. Not all pitches of 72-tone equal temperament are available on the Turkish kanun, however, since kanun-makers affix mandals that only accommodate modulations/transpositions popularly demanded by performers. This has subsequently lead to the familiar interrupted and irregular pattern of mandals on the Turkish kanun becoming a visual guide for players, in facilitating modal and intonational navigation on an instrument which is ordinarily bereft of pitch markers. Some kanun-makers may also choose to divide the semitone distance from the nut of the lower registers into 7 parts instead for microtonal subtlety (and the highest registers, conversely, into 5 parts due to spacing constraints); but do so at the expense of octave equivalences. Despite the mentioned discrepancies, hundreds of mandal configurations are at the player's disposal when performing on an ordinary Turkish kanun.
On the other hand, the nowadays widespread application of equidistant 24-tones on Arabic and 72-tones on Turkish qanun models presents an ongoing source of controversy. This is particularly in regards to how adequate such Eurocentric octave divisions are in faithfully reproducing the traditionally or classically understood fluid pitches and inflexions of Arabic music or Ottoman classical music scales. Pitch measurement analyses of relevant audio recordings reveal that, equal temperaments based on bike-chained "multiples of twelve" are essentially not compatible with authentic Middle Eastern performances; substantiating the notion instruments strictly based on them would clash audibly with a justly tuned/intoned tanbur, oud, ney, or kemenche.
Alternative tuning approaches for the qanun thus also exist. Turkish music theorist Ozan Yarman has proposed, for example, an academical 79-tone temperament for the expression within tolerable error-margins of Maqamat / Makamlar / Dastgaha at all pitch levels, that was implemented by the renowned late luthier Ejder Güleç (1939-2014) on a Turkish kanun. Likewise, the late Swiss-French q?n?n performer Julien Jalâl Ed-Dine Weiss (1953-2015), who was critical of the tuning deficiency of Eurocentric octave divisions in approximating just intervals, is known to have conceived, since 1990, a number of prototypes that were entirely based on low prime-limit or simple integer ratio Pythagorean and harmonic intervals; which were once again built, on instructions from Weiss, by Ejder Güleç.