Gladys Knight and Patti LaBelle will make history on Sunday when they participate in what is being called the Ultimate Verzuz. The soul legends will go through their catalogs live at the Fillmore in Philadelphia. Gladys Knight and the Pips were Motown stars in the ’60s with “I Heard It Through The Grapevine” and later recorded their biggest hit “Midnight Train To Georgia” for Buddah Records. In the ’80s they were still charting with “Love Overboard” and “Save The Overtime (For Me)” before disbanding. Last year Gladys Knight sang the national anthem at the Super Bowl. Patti LaBelle was also active in the ’60s with her group Patti LaBelle and the Bluebelles. They changed their name to LaBelle in the ’70s and “Lady Marmalade” became a signature song that was later remade in 2002 by Lil’ Kim, Pink, Mya and Christina Aguilera. LaBelle was solo in the ’80s and had hits with “If Only You Knew,” “On My Own” and the Prince-penned “Yo Mister” among others. LaBelle and Knight recorded Babyface’s “Superwoman” with Dionne Warwick in 1991. The artists will battle it out tomorrow at 8 PM ET on the Verzuz Instagram account and Apple Music.