Early R&B evolved from Blues (chords and riffs) and Jazz (swing rhythms and a horn-driven line-up). By the mid-1950's the subgenres Doo Wop, Electric Blues, and New Orleans R&B had emerged. Urbanized R&B became the Soul of the 1960's from which Funk emerged a decade later.
Urban is the smooth, polished R&B/Soul of the 1980's and 1990's. Contemporary R&B retains the slick production values while reclaiming the grit and spirit of classic R&B and Soul.