MUSICAL INSTRUMENTS bowed instruments

cello contrabass dilruba erhu esraj gadulka gehu hurdy gurdy jinghu kemence kit kokyu kobyz kucho morinkhuur nyckel harpa psaltery rebec sarangi sarinda stroh violin tromba marina violin viola

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. 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. For centuries, viola makers have experimented with the size and shape of the viola, often compensating by tweaking the proportions or shape of the instrument in order to make an instrument with a shorter scale length and lighter weight, but which 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. The Tertis model viola, which has wider bouts and deeper ribs to promote a better viola tone, is another slightly "non-standard" shape which allows the player to use a larger instrument than normal. 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):violas played in the same manner as cellos (see vertical viola); and the eye-catching "Dali-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. (Quotation:Wikipedia)

strings / bowed instruments / viola