I wasn't sure, so I asked some of the Aretha/Cissy experts at CW. They said that it is indeed her(and googling around the internet said so too) and that actually, it was John Houston's idea to have her sing that part! A little more trivia for y'all. :p There's such a rich history there with the Drinkard girls, I'm hoping one of these days I'll get ahold of Cissy's autobiography.

Whitney masterpiece I'm feeling at the moment: God Bless America, live in NYC in 1999. In this patriotic sequel to her legendary SSB performance, Whitney does what she does best: Combines earth-shattering power, clarity, and range, with a torn-from-the-gut gospelicious flair.