Gershwin’s Porgy and Bess has a really interesting history. It was always intended as a “grand opera”; pretty much the first American one. It was written for the Metropolitan Opera but not performed there until 1985 and between it’s Boston debut in 1935 and a production in Houston in 1976 it was virtually always performed in a much cut edition designed for Broadway. In fact by the time of the Houston production it was being done much at all; being seen as dated and dealing with issues of race that were particularly highly charged in Civil Rights Era America. It took a bold, young Deneral Manager, David Gockley, and a Gershwin enthusiast, John DeMain, to recreate an opera rather than a musical. It’s been following them round ever since and so, not very surprisingly, Gockley, now in charge in San Francisco, chose to stage it there last year in a new production by Francesca Zambello with DeMain conducting.