Chris in Portland neglects to mention that beneath Soldier Field was a complex wherein much of our early WWII nuclear research was done. Apparently, none of the performers was irradiated, though Ms. Sumac's voice sounded as if it might have been. A five octave range truly beggars the imagination, not to mention credibility. I never heard her in person, but she was a master of staging and promotion and did have an extraordinarily different vocal quality, whatever her actual range. I some weird way, she reminds me of a musical version of Norma Desmond, waiting for her "last comeback."