Gladys Knight; Patti LaBelle

In this Tuesday, June 26, 2007, file photo, Gladys Knight, left, and Patti LaBelle perform during the Gerald Levert Tribute at the 7th annual BET Awards in Los Angeles. Producers of the show that celebrates Duke Ellington’s years at the Cotton Club say that Patti LaBelle, Gladys Knight and Natalie Cole will take turns as special guest stars during the summer of 2104. (AP Photo/Kevork Djansezian, File)

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