Janet Jackson collaborated with former Prince associates Jimmy Jam and Terry Lewis on her third studio album "Control" (1986); the album's second single "Nasty" has been described as the origin of the new jack swing sound, a genre innovated by Teddy Riley. Riley's work on Keith Sweat's "Make It Last Forever" (1987), Guy's "Guy" (1988), and Bobby Brown's "Don't Be Cruel" (1998) made new jack swing a staple of contemporary R&B into the mid-1990s. New jack swing was a style and trend of vocal music, often featuring rapped verses and drum machines. The crossover appeal of early contemporary R&B artists in mainstream popular music, including works by Prince, Michael and Janet Jackson, Whitney Houston, Tina Turner, Anita Baker, and The Pointer Sisters became a turning point for black artists in the industry, as their success "was perhaps the first hint that the greater cosmopolitanism of a world market might produce some changes in the complexion of popular music."