Season 30 60 Minutes Season 30 I.G./The Piano Man/Turning Around Denny’s Episode 31 I.G./The Piano Man/Turning Around Denny’s April 26, 1998 "I.G." investigates the shortage of immune globulin which is a necessary drug for people with crippled immune systems. "The Piano Man" profiles recording artist Billy Joel. "Turning Around Denny's" looks…