Barbara and Brenda were a lesser-known American soul duo from the 1960s. Their notable contribution to the music industry was their ability to combine traditional gospel and R&B elements, creating a distinctive, soulful sound. The duo, sisters Barbara and Brenda Gross, are best known for their 1967 hit single "That's When You've Got Soul". Despite a relatively brief career, their unique style and soulful harmonies helped to contribute to the rich tapestry of 1960s soul music.