In this May 22, 1992, file photo, talk show host Johnny Carson, right, appears with the show’s announcer Ed McMahon during the final taping of the
In this May 22, 1992, file photo, talk show host Johnny Carson, right, appears with the show's announcer Ed McMahon during the final taping of the "Tonight Show" in Burbank, Calif. Content from "The Tonight Show Starring Johnny Carson" is available for digital download. Starting Tuesday, July 23, 2013, two volumes of material from the King of Late Night can be purchased from the iTunes store. (AP Photo/Douglas C. Pizac, File)