 Today, a special tribute to Lawrence Tibbett. We're hearing him sing I Got Plenty of Nothin' from George Gershwin's Porgy and Bess. The character Porgy is black and Tibbett was white. And that's a big part of our conversation today. Who gets to perform what and who decides? Here again is our guide, cultural historian Joe Horowitz. So this is another of the Porgy and Bess tracks that Tibbett recorded in 1935, the year Porgy and Bess opened on Broadway.