It may be hard to nail down what gives someone “soul,” but two iconic performers are taking that je ne sais quoi on tour. Gladys Knight (“Midnight Train To Georgia”) and Patti LaBelle (“Lady Marmalade”) are joining forces for a summer tour that breezes through Dallas-Fort Worth.

They'll take the stage together at Texas Trust CU Theatre in Grand Prairie on Sunday, June 18.

Both women came up as frontwomen of groups — Knight with her family as Gladys Knight & the Pips, and LaBelle with girl group Labelle. Knight stayed more in the realm of soul and R&B, while LaBelle crossed over to a more rock sphere. Both have won numerous awards and are considered pioneers in the genre.

Knight and LaBelle are the same age, but after decades of friendship spanning the majority of their lives, the former calls the latter her “little sister.”

The pair famously first appeared together in the 1986 HBO special Sisters in the Name of Love, and have been seen as a pair many times since, including when LaBelle bestowed Knight with her Kennedy Center honors in 2022, and even facing off in a Verzuz battle (a webcast stream in which the two artists chatted and took turns singing karaoke to their own tracks).

The duo will be hard to catch elsewhere, as both are on separate tours that only sometimes converge. In Texas, LaBelle will perform at San Antonio’s Majestic Theater on June 17, before she's joined by Knight the following day in Grand Prairie. They'll then travel to Austin, where they'll play a show together at the Bass Concert Hall on June 19. Knight’s independent tour schedule does not show any Texas dates.

Tickets for the Dallas-Fort Worth performance are available through AXS.com.