Warren has also produced numerous jazz, pop, R&B, contemporary Christian, and gospel artists, typically arranging those recordings, often performing on them (on piano, keyboards, or vocals), and often writing or co-writing the melodies and lyrics. Warren is best known as an original member of the a cappella vocal group Take 6, for having composed the underscore to the number-1 film "The Wedding Planner (2001)," for producing and arranging songs for the hit film "Sister Act 2 (1993)," and for producing and arranging most of the soundtrack to the 1996 Whitney Houston film "The Preacher's Wife"—the best-selling Gospel album of all time.