A 16-ounce package of polished wood, strings, and air, the violin is perhaps the most affordable, portable, and adaptable instrument ever created. As congenial to reels, ragas, Delta blues, and indie rock as it is to solo Bach and late Beethoven, it has been played standing or sitting, alone or in groups, in bars, churches, concert halls, lumber camps, even concentration camps, by pros and amateurs, adults and children, men and women, at virtually...