This instrument first emerged in the sixteenth century and evolved substantially to its present form in the eighteenth century with Antonius
Stradivarius. Certain changes were made in the nineteenth century to in crease the power and brilliance of the violin. The bow, "the soul of the instrument," is strung with horsehair, and it assumed its present form about 1780 in the hands of Franfois Tourte, still considered the greatest of all bowmakers.
The violin is fully chromatic (that is, can play all the semitones) throughout its range. Originally the violin I part had more interesting and difficult things to do than the violin II. Since Wagner, however, the latter part has become increasingly difficult, and in some scores one part is as difficult as the other.
Almost any violin concerto will give an idea of the violin's capacity for
singing tone and brilliant passage work.
Bach Brandenburg Concerto No1 Part 1