Opera is a fragile, complex art, but it flourished extravagantly in San Francisco during the Gold Rush years, a time when daily life in the city was filled with gambling, duels, murder, and suicide. In the history of the United States there has never been a rougher town than Gold Rush San Francisco, yet there has never been a greater frenzy for opera than developed there in these exciting years.

How did this madness for opera take root and grow? Why did the audience's generally drunken, brawling behavior gradually improve? How and why did Verdi emerge as the city's favorite composer?...