Проверил в Яндексе и Гугле - на слово "контровиола" вхождений не найдено. Ура, я первый

О ужас! Пятая струна, как пятая нога явно лишняя!
Спасибо!
А какие струны не знаете? Наверное, к скрипичным добавлена "до", как у альта.

Если кто-то владеет итальянским, есть спец.статейка об этом инструменте и Паганини:
http://www.pentasuglia.it/pdf/pdf_pagconf/11-La%20contro%20viola%20di%20Paganini.pdf

Спасибо, уже разобралась

А вот немножко на английском (с сайта скрипичного мастера Биссолотти):

In 1982 the virtuoso Italian violinist Salvatore Accardo asked Bissolotti to make him a large five-string viola. Maestro Accardo needed this instrument in order to play the Sonata for gran viola by Niccolò Paganini correctly. The adjective "gran"refers to a special five-string viola known as the Paganini "controviola"which the well-known Genovese virtuoso supposedly commissioned from Francesco Borghi, a violin maker of Forlì. There were no longer any traces of this old "controviola", nor did any drawings or documentation exist. This only fuelled the challenge for Bissolotti to construct the "gran Paganini viola". In his customary fashion, Bissolotti approached the task by studying the works of the antique cremonese masters, who still remain the uncontested reference points for modern makers. As the basis for the inside mould he used a 41 cm. Stradivari mould of a 1672 viola preserved in the Stradivari Museum. After careful study he lengthened the mould so that it could accomodate five strings. Appropriate thicknesses were studied to take into consideration the greater tension on the strings on the bridge. The bass bar was made larger and stronger than normal and even the f-holes underwent appropriate modifications. While respecting Stradivari's style, he completely redesigned the head to accomodate the extra peg. All of the accessories for the set-up were hand crafted as nothing similar was to be found on the market.
The five strings were commissioned as they were longer than the usual lengths.
With these changes the master attempted to unite elegance and practicality. The final result was an excellent instrument both from an artistic as well as an acoustical point of view. The instrument fully satisfied the demanding Accardo as well as the equally demanding Bissolotti. Not entirely content with this exceptional result, the Cremonese maker built three more Paganini controviolas of different measurements. Today these extraordinary instruments are dispersed throughout the world, thus demonstrating the vitality and quality of modern Cremonese violin making.

Спасибо большое!

Огромное, огромное спасибо.

Спасибо огромное за раздачу! Просто обожаю Венецианский карнавал!

Большое спасибо!

Огромное спасибо за великолепную подборку!

Спасибо!