Porgy and Bess ATLANTA Atlanta Opera      2/26/11 George Gershwin’s Porgy and Bess is a period piece that provides a glimpse of life on Catfish Row — a former Charlestown mansion converted to a black tenement house — and a goldmine of early-twentieth-century music that remains as lyric and operatic as ever. Atlanta Opera presented Porgy and Bess in 2005. On February 26, the company again showcased its enviable Porgy opera chorus, directed by Walter Huff, which performed Gershwin’s opera at the Opéra Comique and elsewhere in Europe during the summer of 2008. Truly the omnipresent chorus was spontaneous in…