Foster/McElroy, comprised of Denzil Foster and Thomas McElroy, is a renowned American music production duo. They are best known for their innovative contributions to the R&B genre in the late 1980s and early 1990s, which included a fusion of soul, funk, and electronic music. They played instrumental roles in the formation and success of influential girl groups such as En Vogue and Tony! Toni! Toné!. With a signature sound marked by tight vocal harmonies and catchy, rhythm-driven tracks, Foster/McElroy's impact on contemporary R&B is considerable.