Monday, July 26, 2010

Voilin















The viola (pronounced /viˈoʊlə/ or /vaɪˈoʊlə/[1]) is a bowed string instrument. It is the middle voice of the violin family, between the violin and the cello.
The casual observer may mistake the viola for the violin because of their similarity in size, closeness in pitch range (the viola is a
perfect fifth below the violin), and nearly identical playing position. However, the viola's timbre sets it apart: its rich, dark-toned sonority is more full-bodied than the violin's. As its mellow voice is frequently used for playing inner harmonies, the viola does not enjoy the wide solo repertoire or fame of the violin.

Form of the viola:
The viola is similar in material and construction to the violin but is larger in size and more variable in its proportions. A "full-size" viola's body is between one and four inches longer than the body of a full-size violin (i.e., between 15 and 18 inches (38 and 46 cm)), with an average length of about 16 inches (41 cm). Small violas made for children typically start at 12 inches (30 cm), which is equivalent to a half-size violin. Often, a fractional-sized violin will be strung with the strings of a viola (C, G, D and A) for those children who need even smaller sizes.[2] Unlike the violin, the viola does not have a standard full size. The body of a viola would need to measure about 21 inches (53 cm) long to match the acoustics of a violin, making it impractical to play in the same manner as the violin.[3] For centuries, viola makers have experimented with the size and shape of the viola, often tweaking the proportions or shape of the instrument to make an instrument with a shorter scale length and lighter weight, but that still has a large enough sound box to create an unmistakable "viola sound."
Experiments with the size of the viola have tended to increase it in the interest of improving the instrument's sound. These include Hermann Ritter's "viola alta", an instrument measuring about 18.9 inches (48 cm) intended for use in
Richard Wagner's operas.[4] The Tertis model viola, which has wider bouts and deeper ribs to promote a better viola tone, is another slightly "non-standard" shape that allows the player to use a larger instrument. Many experiments with the acoustics of a viola, particularly increasing the size of the body, result in a much deeper tone of the instrument, making the instrument resemble the tone of a cello. Since many composers wrote for a traditional-sized viola, changes in the tone of a viola, particularly in orchestral music, can have unintended consequences on the balance in ensembles.
More recent (and more radically shaped) innovations address the ergonomic problems of playing the viola by making it shorter and lighter while finding ways to keep the traditional sound. These include Otto Erdesz "cutaway" viola (which has one shoulder cut out to make shifting easier);
[the "Oak Leaf" viola (which has two extra bouts); viol shaped violas like Joseph Curtin's "Evia" model (which also utilizes a moveable neck and a maple-veneered carbon fiber back to reduce weight):[6] violas played in the same manner as cellos (see vertical viola); and the eye-catching "Dalí-esque" shapes of both Bernard Sabatier's violas in fractional sizes (which appear to have melted) and of David Rivinus' "Pellegrina" model violas.
Other experiments besides those dealing with the "ergonomics vs. sound" problem have appeared. American composer Harry Partch fitted a viola with a cello neck to allow the use of his 43-tone scale. Luthiers have also created five-stringed violas, which allow a greater playing range. Modern music is played on these instruments, but viol music can be played as well.

Playing the viola:
A person who plays the viola is called a violist or simply a viola player. While it is similar to the violin, the technique required for playing viola has many differences. The difference in size accounts for some of the technical differences, as notes are spread out farther along the fingerboard often requiring different fingerings. The less responsive strings and heavier bow warrant a somewhat different bowing technique. The viola requires the player to lean more intensely on the strings compared to the violin.
Compared to violin, the viola will generally have a larger body as well as a longer string length, which is why younger violists or even some old tend to get smaller sized violas for easier playing. The most immediately noticeable adjustments a player accustomed to playing violin has to make are to use wider-spaced fingerings. It is common for some players to use a wider and more intense
vibrato in the left hand facilitated by employing the fleshier pad of the finger rather than the tip, and to hold the bow and right arm farther away from the player's body. The player must also bring the left elbow farther forward or around, so as to reach the lowest string. This allows the fingers to be firm and create a clearer tone. Unless the violist is gifted with especially large hands, different fingerings are often used, including frequent use of half position and shifting position, where on the violin staying in one place would suffice.
The viola is generally strung with thicker strings than the violin. This, combined with its larger size and lower pitch range, results in a deeper and mellower tone. However, the thicker strings also mean that the viola "speaks" more slowly than its soprano cousin. Practically speaking, if a violist and violinist are playing together, the violist must begin moving the bow a fraction of a second sooner than the violinist to produce a sound that starts at the same moment as the violinist's sound. The thicker strings also mean that more weight must be applied with the bow to make them speak.

Bow frogs, top to bottom: violin, viola, cello
The viola
bow has a wider band of horsehair than a violin bow, particularly noticeable near the frog (or "heel" in the UK). Viola bows (70 to 74 g) are heavier than violin bows (58 to 61 g). The profile of the outside corner of a viola bow frog generally is rounded, compared to the rectangular corner usually seen on violin bows.





Tuning:
The viola's four strings are normally tuned in fifths: C3 (an octave below middle C) is the lowest, with G3, D4 and A4 above it. This tuning is exactly one fifth below the violin, so that they have three strings in common—G, D, and A—and is one octave above the cello. Although the violin and viola have three strings tuned the same, the tone quality or sound color is markedly different.
Violas are tuned by turning the
pegs near the scroll, which the strings are wrapped around. Tightening the string raises the pitch; loosening the string lowers the pitch. The A string is normally tuned first, typically to 440 Hz or 442 Hz (see pitch). The other strings are then tuned to it in intervals of perfect fifths, bowing two strings simultaneously. Most violas also have adjusters (also called fine tuners) that are used to make finer changes. These permit the tension of the string to be adjusted by rotating a small knob at the opposite end of the string, at the tailpiece. Such tuning is generally easier to learn than using the pegs, and adjusters are usually recommended for younger players and put on smaller violas, although they are usually used in conjunction with one another. Adjusters work best, and are most useful, on higher tension metal strings. It is common to use one on the A string even if the others are not equipped with them. The picture on the right shows normal stringing of the pegs. Some violists reverse the stringing of the C and G pegs, so the thicker C string does not turn so severe an angle over the nut, although this is uncommon.
Small, temporary tuning adjustments can also be made by stretching a string with the hand. A string may be tuned down by pulling it above the fingerboard, or tuned up by pressing the part of the string in the pegbox. These techniques may be useful in performance, reducing the ill effects of an out-of-tune string until an opportunity to tune properly.
The tuning C-G-D-A is used for the great majority of all viola music. However, other tunings are occasionally employed both in
classical music (where the technique is known as scordatura) and in some folk styles. Mozart, in his Sinfonia Concertante for Violin, Viola and Orchestra, which is in E flat, wrote the viola part in D major and specified that the viola strings were to be raised in pitch by a semitone; his intention was probably to give the viola a brighter tone to avoid it being overpowered by the rest of the ensemble. Lionel Tertis, in his transcription of the Elgar cello concerto, wrote the slow movement with the C string tuned down to B flat, enabling the viola to play one passage an octave lower. Occasionally the C string may also be tuned up to D.

Violists:
here are only a few truly well known viola virtuosi, perhaps because little virtuoso viola music was written before the twentieth century. The most important viola pioneers from the twentieth century were Lionel Tertis, William Primrose, Paul Hindemith, Théophile Laforge, Cecil Aronowitz, Maurice Vieux, Vadim Borisovsky, Lillian Fuchs, Frederick Riddle, Walter Trampler, Ernst Wallfisch, and Emanuel Vardi, the first violist to record the 24 Caprices by Paganini on viola. Many noted violinists have publicly performed and recorded on the viola as well, among them Eugène Ysaÿe, Yehudi Menuhin, David Oistrakh, Pinchas Zukerman, Maxim Vengerov, Julian Rachlin and Nigel Kennedy.
Among the great composers, several preferred the viola to the violin when playing in ensembles,
[8] the most noted being Ludwig van Beethoven, Johann Sebastian Bach[9] and Wolfgang Amadeus Mozart. Numerous other composers also chose to play the viola in ensembles, including Joseph Haydn, Franz Schubert, Felix Mendelssohn, Antonín Dvořák, and Benjamin Britten. Among those noted both as violists and as composers are Rebecca Clarke and Paul Hindemith. Contemporary composer and violist Kenji Bunch has written a number of viola solos.
The term "violist" is not used universally in English; some players, generally British, prefer "viola player", as the word "violist" is used in the UK to mean "player of the
viol".

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